The Body of a Motor Neurone
In its centre is a large clear spherical nucleus, with a nucleolus. The body-substance is prolonged into five dendrites and an axon. Neuro-fibrillæ are seen in dendrites and axon. They traverse the body of the cell in all directions, in little bundles which are separated by angular granules of stainable substance (tigroids).

The Surface of the Left Cerebral Hemisphere, Cerebellum,and Medulla Oblongata.
Sensory areas are enclosed by broken lines; certain centres in the association-zones are marked by dots. The sensory area of smell is on the inner aspect of the brain; so also is the area of vision which borders the calcarine and retrocalcarine fissures, and only rarely extends on to the external surface, as shown in the diagram. The sensory area of hearing is largely hidden within the fossa of Sylvius, the opening into which is indicated by the dark line above it. The kinæsthetic-sensory areas for the various muscles of the body occupy the territory between the dotted line in front and the bottom of the fissure of Rolando behind. They do not extend on to the posterior wall of this fissure. It is impossible at present to define the boundaries of any of the centres in the association-zones.

Highly Magnified Section through the Wall of a Circumvallate Papilla of the Tongue, showing Two Taste-Bulbs.
These sense-organs are groups of elongated epithelial cells, set vertically to the surface. Their cells are of two kinds—the one fusiform, slender, bearing each a bristle-like process which projects through a minute pore left between the superficial cells of the general epithelium; the other thicker and wedge-shaped. Nerve-fibres are connected with the fusiform cells.

Horizontal Section through the Right Eye
The slight depression in the retina in the axis of the globe is the fovea centralis, or yellow spot; the optic nerve pierces the ball to its inner or nasal side. The lens, with its suspensory ligament, separates the aqueous from the vitreous humour. On the front of the lens rests the iris, covered on its posterior surface with black pigment. On either side of the lens is seen a ciliary process, with the circular fibres of the ciliary muscle cut transversely, and its radiating fibres disposed as a fan.

The Retina in Vertical Section
A, after Exposure to Bright Light; B, After Resting in the Dark. The arrow shows the direction in which light traverses the retina. C, Retinal epithelium, with its pigmented fringe. 1, Layer of rods and cones, separated by the external limiting membrane from 2, the layer of the nuclei of the rods and cones. 3, The ganglion-cells of the retina, which are homologous with the cells of the afferent root of a spinal nerve. Their peripheral axons ramify beneath the sensory epithelium (rods and cones and their nucleus-bearing segments), their central axons in 4, the inner molecular layer. D, Collecting cells on the front of the retina; a a a, their axons which conduct impulses to the brain; b, an efferent fibre from the brain.

The Formation of an Image by the Refracting Media of the Eye
x, The common centre of curvature (nodal point of the several media). Rays which pass through this point are not deflected. y, The principal focus of the system. All rays which are parallel to the optic axis converge to this point. The image of the point A is formed at a, the spot at which a ray parallel with the optic axis meets an unbent ray—the image of B at b.

The External, Middle, and Internal Ear of the Left Side
From right to left, the figure shows the concha and lobule of the ear in profile; the external meatus (abbreviated); the drum, divided vertically, its posterior half visible; the hammer-bone, with the tip of its long arm attached to the drum, an arrow indicating the point of attachment and line of action of the tensor tympani muscle; the anvil attached by a ligament to the bony wall of the middle ear; the stirrup, with its foot-plate almost filling the oval window; the labyrinth, with the three semicircular canals above, and the scala vestibuli below. The curled black line shows the situation of the scala media, or ductus cochleæ (which contains the organ of Corti). Pulsations of sound which move the membrana tympani are transmitted by the three bones to the oval window. They shake the perilymph, producing waves which travel along the scala vestibuli to the apex of the cochlea, whence they return by the scala tympani to the round window (if they do not take a shorter course through the ductus cochleæ). The Eustachian tube opens out of the lower part of the middle ear.

Organ of Corti
The spiral lamina, on the left of the drawing, gives attachment to the membrane of Corti, which stretches to the opposite wall. Below the membrane is a bloodvessel which runs its whole length beneath the tunnel of Corti. The tunnel is formed by pillars—the inner on the left, the outer on the right—which meet above it. On the left of the inner pillar is a hair-cell; to the left of this a nerve-cell with two nuclei. To the right of the outer pillar is a space; to the right of this four hair-cells alternating with four supporting cells, which hold up the reticulated membrane through apertures in which the tufts of hairs project. Three nerve-fibres are seen in the spiral lamina; they cross the tunnel to ramify between the rows of outer hair-cells. The lamina tectoria rests upon the tufts of hairs.

Sense-Organs susceptible to Pressure
All are formed on essentially the same plan; a fibrous capsule invests a group of epithelial cells amongst which a nerve ramifies. The simplest form is known as a Grandry’s corpuscle-a nerve ending in one or two plates between two or three epithelial cells. These organs are found in great numbers in the bills of aquatic birds. If a duck is watched whilst it is gobbling mud at the margin of a pond, it will be seen to have a remarkable capacity for discriminating between the shells of small snails, which it can crush, and stones, which it needs to drop from its bill. Its bill is also provided with small Pacinian corpuscles.

The Anterior Half of the Larynx seen from Behind
The drawing shows the folds of mucous membrane, the vocal cords, which stretch from the tips of the arytenoid cartilages to the recess behind the median portion of the thyroid cartilage. To the outer side of each vocal cord is seen the thyro-arytenoid muscle (cut across), consisting of a broad outer portion, chiefly concerned in closing the glottis during the act of swallowing, and a smaller internal portion, which regulates the length and the thickness of the segment of the cord allowed to vibrate.

Diagram showing the Relative Positions of the Organs of the Chest and Abdomen.
The ribs from the first to the tenth have been cut across in the lateral line. The eleventh and twelfth ribs do not reach sufficiently far forwards to be cut. With the exception of a short segment near its junction with the ascending colon, the small intestine has been removed. The trachea is seen to divide into bronchi beneath the arch of the aorta. The right lung has three, the left two lobes. The kidneys are situated behind all the other viscera. On their upper ends rest the two suprarenal capsules. The lower edge of the right lobe of the liver follows closely the line of the ribs and costal cartilages. Below the left lobe of the liver the stomach comes to the anterior abdominal wall. The transverse colon (large intestine) comes to the anterior wall below the stomach. Below the latter the wall is in contact chiefly with coils of small intestine. The vermiform appendix rests on the posterior wall. Spleen and pancreas are not shown in the diagram.

Red Blood-Corpuscles presenting, some the Surfaces, others the Edges, of their Discs, together with Single Representatives of Four Types of Leucocyte.
A, the most common type, highly amœboid and phagocytic. Its protoplasm is finely granular, its nucleus multipartite. B, a leucocyte closely similar to the last, but larger, and containing an undivided nucleus. It is shown with a cluster of particles of soot in its body-substance. C, a young leucocyte, or “lymphocyte.” D, a coarsely granular leucocyte. Its granules stain brightly with acid dyes—e.g., eosin or acid fuchsin.

A Minute Portion of the Pulp of the Spleen
A Minute Portion of the Pulp of the Spleen,very highly magnified. Stellate connective-tissue cells form spaces containing red blood-corpuscles and leucocytes. In the centre of the diagram is shown the mode of origin of a venule. It contains two phagocytes—the upper with a nucleus, two blood-corpuscles just ingested, and one partially digested in its body-substance; the lower with two blood-corpuscles.

Digestive system in humans
The stomach has been cut across a short distance from the pyloric valve, and removed, to show the viscera which lie behind it. The descending aorta and the vena cava rest upon the vertebral column. They are crossed by the pancreas and the transverse portion of the duodenum. The head of the pancreas is enclosed by the curvatures of the duodenum. The ducts of the liver and pancreas are seen entering the descending duodenum side by side.

Diagram of a Lobule of the Liver
Diagram of a Lobule of the Liver divided vertically through its Axis. In its centre is a space, the intralobular vein, through which the blood falls into a branch of the hepatic vein, on its way to the heart. An interlobular branch of the portal vein, which brings the blood from the digestive organs, pours it by many smaller vessels over the surface of the lobule. It filters into the lobule through innumerable pseudo-capillary vessels, or spaces, between the radiating columns of liver-cells. Arterial blood is brought to the lobule by a twig of the hepatic artery. Bile is drained away from it by an affluent of the hepatic duct. In the lower part of the diagram seven liver-cells are shown, forming a divided column, magnified about 300 diameters. The cells are loaded with glycogen, and contain minute globules of fat. Red blood-corpuscles and two leucocytes are seen between the columns of liver-cells. One of the leucocytes has ingested two blood-corpuscles.

The Diaphragm and Organs in Contact with it
The Diaphragm and Organs in Contact with it—A, in Expiration; B, at the End of a Deep Inspiration. Transverse Vertical Sections in the Line of the Armpit. A, At the end of an ordinary expiration the lung does not extend below the upper border of the eighth rib. From this level to the middle or lower border of the tenth rib the two layers of the pleura covering respectively the inner wall of the chest and the upper surface of the diaphragm are in contact. B, When the lung is distended with air it occupies the whole of the pleural cavity.

The Heart cut in the Plane of its Long Axis, and the Vessels which open into and out of it
Chordæ tendineæ attach the margins of the auriculo-ventricular valves to musculi papillares which project from the inner aspect of each ventricle.

A Section approximately at Right Angles to the Long Axis of the Heart
A Section approximately at Right Angles to the Long Axis of the Heart, exposing the Four Valves which lie very nearly in the Same Plane. The semilunar valve which guards the aperture of the pulmonary artery is the nearest to the breast-bone.

Manometer for measuring Blood-Pressure
A U-tube contains mercury, on which floats a rod supporting a scratching point, which makes a “tracing” on blackened paper wrapped round a revolving drum. Between the manometer and the cannula which is introduced into the central end of a cut artery is a three-way cock, which leads to a pressure-bottle containing a half saturated solution of sodic sulphate. This solution prevents blood from clotting. Before it is connected with the artery the apparatus is filled from the pressure-bottle. The cock is then turned into the second position, and the bottle raised until the mercury in the manometer stands at a level somewhat higher than that which it may be expected to attain under the influence of blood-pressure. The cannula being then inserted into an artery, the cock is turned into the third position, which places the manometer in connection with the blood, and excludes the pressure-bottle. As the mercury is a little higher than blood-pressure, some of the sodic sulphate solution enters the artery, but no blood enters the cannula. The scratching point, rising and falling with every variation in blood-pressure, makes a record on the soot-blackened paper, which is subsequently removed from the drum, and varnished.

Sphygmograph
A, An ivory button which is pressed on the skin over the radial artery by a metal spring. B, A continuous screw which works against the cogwheel C. By rotating B, the lever D is raised to a position in which its point scratches the travelling-plate E (covered with blackened paper). F, A box containing clockwork which moves E. G, A screw by means of which the pressure of the spring is adjusted to the force of the pulse.

Biceps Muscle in Action
The power of muscle varies as its cross-section. For human muscles the maximum lift amounts to from 7 to 10 kilogrammes for each square centimetre. This is a large figure, but it must be remembered that, owing to the arrangement of the bones as levers, most muscles act at a great mechanical disadvantage. The greater the difference in distance from the fulcrum between the point of application of the force and the point of incidence of the weight, when the force acts nearer to the fulcrum than the weight, the greater is the mechanical disadvantage. The greater also is the rapidity with which the weight is lifted. What is lost in strength is gained in swiftness

Hunting
Hunting

Golf
Golf

Fishing
Fishing

Cricket
Cricket

Coursing
Coursing

Coaching

Boxing
Boxing

Boating
Boating

Archery
Archery

Skating
Skating

Shooting
Shooting

Racing
Racing

Polo's Sheep
Polo's Sheep

Elaphurus Davidianus
Elaphurus Davidianus

Ailuropus Melanoleucus
Besides these two varieties of bears, there is another animal, which, though it is not properly a bear, resembles one so closely that it is classed by the Chinese and Tibetans in that family. It is known to the Chinese as hua hsiung, or "mottled bear," and Milne Edwards, who studied and described it, has called it Ailuropus melanoleucus. This animal was, I believe, discovered by that enterprising missionary and naturalist, Father Armand David (who called it "white bear"), in the little eastern Tibetan principality of Dringpa or Mupin, in western Ssu-ch'uan.[13] Five specimens have so far been secured of this very rare animal: three are in the Jardin des Plantes of Paris, the other two in the Museum at the Jesuits' establishment, at Zikawei, near Shanghai.

Rocky Mountain Sheep
Rocky Mountain Sheep

Tilting at the Ring
At the commencement of the seventeenth century, the pastime of running at the ring was reduced to a science. Pluvinel, who treats this subject at large, says, the length of the course was measured, and marked out according to the properties of the horses that were to run: for one of the swiftest kind, one [Pg 125]hundred paces from the starting place to the ring, and thirty paces beyond it, to stop him, were deemed necessary; but for such horses as had been trained to the exercise, and were more regular in their movements, eighty paces to the ring, and twenty beyond it, were thought to be sufficient. The ring, says the same author, ought to be placed with much precision, somewhat higher than the left eyebrow of the practitioner, when sitting upon his horse; because it was necessary for him to stoop a little in running towards it

The Water Quintain—XIV. Century
To the best of my recollection, Fitzstephen is the first of our writers who speaks of an exercise of this kind, which he tells us was usually practised by the young Londoners upon the water during the Easter holidays. A pole or mast, he says, is fixed in the midst of the Thames, with a shield strongly attached to it; and a boat being previously placed at some distance, is driven swiftly towards it by the force of oars and the violence of the tide, having a young man standing in the prow, who holds a lance in his hand with which he is to strike the shield: and if he be dexterous enough to break the lance against it and retain his place, his most sanguine wishes are satisfied: on the contrary, if the lance be not broken, he is sure to be thrown into the water, and the vessel goes away without him, but at the same time two other boats are stationed near to the shield, and furnished with many young persons who are in readiness to rescue the champion from danger. It appears to have been a very popular pastime; for the bridge, the wharfs, and the houses near the river, were crowded with people on this occasion, who come, says the author, to see the sports and make themselves merry. The water quintain, taken from a manuscript of the fourteenth century, in the Royal Library, where a square piece of board is substituted for the shield, is represented below.

The Unearthing of a Fox
The engraving is from a manuscript in the Royal Library, written about the commencement of the 14th century.

The Saracen Quintain
Here is the quintain in the form of a Saracen, from Pluvinel.

The Ring in Tilting
Tilting or, as it is most commonly called, running at the ring, was also a fashionable pastime in former days; the ring is evidently derived from the quintain, and indeed the sport itself is frequently called running or tilting at the quintain. In the figure is the form of the ring, with the sheath, and the manner in which it was attached to the upright supporter, from Pluvinel. The letter A indicates the ring detached from the sheath; B represents the sheath with the ring inserted and attached to the upright post, in which there are several holes to raise or lower the ring to suit the conveniency of the performer.

The Queen of Rabbits

The Pel Quintain—XIV. Century
The quintain in its original state was not confined to the exercise of young warriors on horseback: it was an object of practice for them on foot, in order to acquire strength and skill in assaulting an enemy with their swords, spears, and battle-axes. I met with a manuscript in the Royal Library, written early in the fourteenth century, entitled "Les Etablissmentz des Chevalerie," wherein the author, who appears to have been a man scientifically skilled in the military tactics of his time, strongly recommends a constant and attentive attack of the pel (from the Latin palus), for so he calls the post-quintain. The pel, he tells us, ought to be six feet in height above the ground, and so firmly fixed therein as not to be moved by the strokes that were laid upon it. The practitioner was then to assail the pel, armed with sword and shield in the same manner as he would an adversary, aiming his blows as if at the head, the face, the arms, the legs, the thighs, and the sides; taking care at all times to keep himself so completely covered with his shield, as not to give any advantage supposing he had a real enemy to cope with.

The Paper Windmill

The Knave of Pinks

The King of Columbines

The Ace of Roses

Tables.—XIV. Century

Tables.—XIII. Century

Sword-Play—XIII. Century

Sword-Play—XIII. Century 2

Sword-Dance
This drawing represents two men, equipped in martial habits, and each of them armed with a sword and a shield, engaged in a combat; the performance is enlivened by the sound of a horn; the musician acts in a double capacity, and is, together with a female assistant, dancing round them to the cadence of the music; and probably the actions of the combatants were also regulated by the same measure.

Swine Hunting - IX Century
The engraving represents a Saxon chieftain, attended by his huntsman and a couple of hounds, pursuing the wild swine in a forest, taken from a manuscriptal painting of the ninth century in the Cotton Library.

Stilt Dancing.—XIII. Century
Materials for Dancing, specifies masques, castanets, and a ladder of ten rounds. I apprehend the ladder-dance originated from the ancient pastime of walking or dancing upon very high stilts. A specimen of such an exhibition is here given from a MS. roll in the Royal Library, written and illuminated in the reign of Henry III. The actor is exercising a double function, that is, of a musician, and of a dancer.

Spearing a Boar—XIV. Century
The above is a representation of the manner of attacking the wild boar, from a manuscript written about the commencement of the fourteenth century, in the possession of Francis Douce, Esq.

Slings of Warfare
Sometimes the sling is attached to a staff or truncheon, about three or four feet in length, wielded with both hands, and charged with a stone of no small magnitude. Those slings appear to have been chiefly used in besieging of cities, and on board of ships in engagements by sea. The following engraving represents a sling of this kind, from a drawing supposed to have been made by Matthew Paris, in a MS. at Bennet College, Cambridge.

Slinging—VIII. Century
The art of slinging of stones was well known and practised at a very early period in Europe, but we have no authority to prove that it was carried to so high a pitch of perfection in this part of the globe, as it appears to have been among the Asiatic nations. It is altogether uncertain, whether the ancient inhabitants of Britain were acquainted with the use of the sling or not; if the negative be granted, which hardly seems reasonable, we must admit the probability of their being taught the properties of such an instrument by the Romans, who certainly used it as a military weapon. We can speak more decidedly on the part of our ancestors the Saxons, who seem to have been skilful in the management of the sling; its form is preserved in several of their paintings, and the manner in which it was used by them, as far back as the eighth century, may be seen below, from a manuscript of that age in the Cotton Library. It is there represented with one of the ends unloosened from the hand and the stone discharged. In the original the figure is throwing the stone at a bird upon the wing, which is represented at some distance from him.

Shuttle-cock.—XIV. Century

Saxon Hawking—IX. Century.
This engraving represents a Saxon nobleman and his falconer, with their hawks, upon the bank of a river, waiting for the rising of the game. The delineation is from a Saxon manuscript written at the close of the ninth century, or at the commencement of the tenth; in the Cotton Library.