- The Wolf among the Sheep. (John x. 12)
- The Woolly Kangaroo
- The yellow fever mosquito (Aëdes calopus)
- The young of the common Eel and its metamorphosis
- The Zoëa Larva of a Species of Sergestes
- THE ZOEA OF THE COMMON CRAB
- The ‘Wonderful Cynocephalus’
- Thelemark cows of Norway
- There was a useless battle
- Thirteen-Spotted Lady Beetle
- Thomas
- Three kittens
- Three kittens and a basket
- Three Spined Stickleback
- Tiger
- Tiger
- Tiger Cub
- Tiger head
- Tiger snake
- Tired of play
- Title-page of Mellerstadt’s edition of the Anatomy of Mondino, Leipzig, 1493. The scene is laid in the open air
- Topography of a Bird
- Tortoise
- Tortoise Shell Manx
- Tortoiseshell-and-white Cat, finely marked
- Trapping a polar bear
- Tree falcon
- Tree Swallow
- Tree-porcupine
- Tropicbird
- Trotting across a field
- Trout
- Trypanosoma brucei
- Trypanosoma Ziemanni, from the blood of the little owl
- Trypanosoma Ziemanni, from the gut of the gnat
- Tufted Titmouse
- Tulbaghia violacea
- Turkey Vulture
- Turkey Vulture
- Turtle
- Tutored Bear.—XIV. Century
- Tutored Bear.—XIV. Century
- Twisted Lime worm ( Serpula contortuplicata )
- Two birds watching a bug
- Two calves
- Two cats
- Two cats
- Two cats running
- Two children offering hay to cow
- Two children riding ponies on the beach
- Two common centipedes
- Two cows
- Two cows
- Two deer
- Two dogs
- Two dogs
- Two dogs
- Two dogs
- Two dogs and a horse
- Two girls feeding a cow