- Hermit Crab
- Hoeing
- Horned Head-dress Beatrice, Countess of Arundel, 1439
- Hunifer
- i 189
- In full play
- Inaguration
- Inundation
- Ironworking Pit
- Italian Nobleman
- Kentucky
- King Charlemagne receiving the Oath of Fidelity
- King of the Franks
- King or Chief of Franks armed with the Seramasax, from a Miniature of the Ninth Century
- Kittens after the Show
- Kittens at the Show
- Labouring Colon
- Labouring Colon (Twelfth Century)
- Labouring Colons (Twelfth Century)
- Lady
- lady 2
- Lady 4
- lady with hat
- Land Crab
- Landing at Jamestown
- Larva of Forficula
- Last Rites
- Lemon
- Leodice sanguinea
- Lets go skating
- Letter to Mr Raymond
- Light Artillery of Gustavus Adolphus
- Light White and Sandy She-Cat and Kittens
- Limulus cancriformis
- Lincoln 1860
- Long Haired cat
- Long Haired Cat 'Tiger'
- Long haired kitten 'Chloe'
- Long Haired Persian
- Long Haired Persian 'Bogey'
- Louse of the Cat
- man and woman
- Man tying shoelaces
- Man wih cat
- Man with little dog
- Medlers
- Miracle
- Mountain lion
- Mr. Smith's Tortoiseshell He-Cat
- Mummy
- Muscles of the Horse
- Mysis chamæleon
- Nervous system of a horse
- Nobleman Hunting
- Nocolusia Banksii
- Offerings to a god
- Oliva porphyria
- Olives
- Organ
- Ouah-ab-ra