Zoology Collected works 24 Physiology 17 protoplasm 17 enzymes 14 Animals 12 morphology 12 Invertebrates 10 Science 10 Vertebrates 10 Ecology 9 Mammals 9 Embryology 8 Morphology 8 Ornithology 8 Birds 7 Evolution 7 India 7 Insect 7 Insects 7 Entomology 6 Insecta 6 Metabolism 6 Protozoa 6 Botany 5 Fishes 5 Life sciences 5 Pisces 5 Anatomy 4 Animal behavior 4