The Ethical Animal by C. H. Waddington

Author:C. H. Waddington [Waddington, C. H.]
Language: eng
Format: epub
Tags: History, General, Science, Life Sciences, Biology
ISBN: 9781317352129
Google: ksEtDwAAQBAJ
Publisher: Routledge
Published: 2017-07-20T01:30:49+00:00

__________________

1 In particular, A. Irving Hallowell, A. L. Kroeber and J. H. Steward.

2 Mead. 1959, p. 57

1 In Wells, Huxley and Wells.

2 1947, p. 185.

3 1953.

4 Ed. Roe and Simpson, 1958.

1 1956.

1 1958.

CHAPTER 11

The Course of Evolutionary Progress

THE thesis that the evolutionary system is such that it is characterized by an inherent tendency to evolve in the direction of greater efficiency does not of course imply that such progressive improvements always occur in every evolutionary sequence. There may be other tendencies also in operation, and in some cases these may be dominant and prevent the improvement either of the evolutionary system as a whole or of one or more of its subsystems.

FIG. 3

Diagram of anagenesis and stasigenesis in the evolution of horses during the Tertiary period (Eocene, Oligocene, Miocene, Pliocene and Pleistocene sub-periods). Some of the intermediate types of horse persisted (by stasigenesis) for a considerable time before becoming extinct. The Palaeotheres evolved in the same anagenetic direction as the true horses but became extinct at an early period. (From Huxley 1958.)

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.