TACEA, PROTOZOA, MOLLUSCA, INSECTS and REPTILES ; in mammals, besides a comprehensive account of the class as a whole in the article MAMMALIA, each order has an article devoted to it, among Which PRIMATES, CETACEA, CARNIVORA and PROBOSCIDEA may be mentioned as examples, and the principal animals are fully covered by a series of shorter articles devoted more especially to their natural history—DEER, ANTELOPE, DOG, Fox, LION, CHIMPAN ZEE, ELEPHANT, HORSE, KANGAROO, etc. Birds are treated in the general articles BIRD and ORNITHOLOGY, the latter article includ ing a section on the economic status of birds ; there are, in addi tion, numerous shorter articles on individual birds, e.g., DODO,