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History 2

By Louis Agassiz; Elizabeth Cary Agassiz

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Take a homely and ,ery familiar example, tilat of the brallch of Articulates. Naturalists divide this brauch into three classes,-Insects, Orustacea, and Worms; 3:nd most of them tell you that Worms are lowest, Crustacea next in rank, and that Insects stand highest, while others have placed the Crustacea at the head of the group. We may well a k why. Why does an insect stalld above a crustacean, or, vice ve1'sa, why is a grasshopper or a bu tterfiy structurally snperior to a lobster or a srn'imp?

This is one of a family whose geological antecedents arc very important and interesting. The Mastodons, the Palmotherium, the Dinotherinm, and other large Mammalia of the Tertiaries, are closely related to the Tapir. The elephant, rhinoceros, and the like, are of the same family. From its structural standing next to the elephant, which is placed highest in the group, the embryology of the Tapir would give us a very. complete series of changes. It would seem from some of the fossil remains of this family that the Pachyderms were formedy more nearly related to the Ruminants and Rodents than they now are.

1 26 A JOURNEY IN BRAZIL. he will work out the whole; and so I believe when the laws of embryological development are better understood, naturalists will have a key to the limit of these cycles of growth, and be able to appoint them their natural boundaries even from parti~l data. " Next in importance I would place the Tapirs. This is one of a family whose geological antecedents arc very important and interesting. The Mastodons, the Palmotherium, the Dinotherinm, and other large Mammalia of the Tertiaries, are closely related to the Tapir.

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