- Zebus (var. γ) and Car
- Zebu.—(Var. δ.)
- Zebu
- Zamouse, or Bush Cow
- Young female Bison
- young corn plant
- Young Cape Buffalo
- Yak, from Oriental Annual
- Yak, from Asiatic Transactions
- Wounded Bison
- wood lily covered with underground leaves
- winged fruits of the maple
- Wild Beach plums
- Wild Beach plums
- white potato
- white baneberry
- Two kittens playing on a suitcase
- Two kittens playing
- Two kittens play fighting
- Two kittens
- Two dogs
- Two cats running
- Two cats
- Turtle
- Trypanosoma brucei
- Trout
- Thirteen-Spotted Lady Beetle
- The Surinam Toad
- The Sangu, or Abyssinian Ox
- the pine just starting out in the world, with its six seed leaves
- The house or typhoid fly (Musca domestica)
- the fruit of the poppy
- The fruit of the dandelion is the silvery puffball
- the fruit of Solomon’s seal
- the fruit cluster of the aster
- The flowers of the partridge vine
- The Caterpillar of the Small Elephant Hawk-moth (Chærocampa porcellus)
- The Caterpillar of the Marbled White Butterfly (Arge galathea)
- The Caterpillar of the Eyed Hawk-Moth (Smerinthus ocellatus)
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Third Stage
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Second Stage
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Just before the second moult.
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Full grown
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Fourth Stage
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). First stage
- The Caterpillar of the Elephant Hawk-Moth (Chærocampa elpenor). Fifth Stage
- The Bison
- tadpoles
- Syrian Ox
- sumac
- Stomoxys calcitrans - adult, larva, puparium and details
- Stomach of Manilla Buffalo
- Stages of growth of a squash plant
- squirting cucumber
- Spirochæta gallinarum. After Hindle.
- speckled red berries of the false Solomon’s seal
- sleeping lion
- Sleeping Cat
- Sleeping Bat
- Skull of Short-nosed Ox of the Pampas