- Two girls watching a family of ducks
- Uncle Mose predicts fair weather
- Utensils for Canning Fruit
- Various species of Trypanosoma from the blood of mammals, birds, and reptiles
- Vegetables
- Venice, 1496, showing the ventricles of the brain
- Vertical section of the skull, showing the sinuses of the dura mater
- Washington
- Well-behaved children
- Where a Dinosaur Sat Down
- Wholesome Drinks
- Young Hoactzins
- Young Naturalist