Distribution, affected by climate, 5

affected by physical features, 5

contrasts of, in similar climates, 5

similarities of, in diverse climates, 6

barriers as affecting, 6

study of, dependent on a good classification, 83

of animals an adjunct to geology, 8

of animals requires certain preliminary studies, 8

of animals dependent on physical geography, 35

of animals, as affected by the glacial epoch, 40