Zoology: An Elementary Text-book

Abstract

FIVE years have passed since the third edition of this now well-known text-book appeared, and the authors have taken advantage of the opportunity offered by the call for a new edition to place at their readers' disposal some facts and inferences due to certain recent researches. Thus, in the account of Amoeba, Jennings's view that the creature's movements are due to contractility of the ectoplasm is followed (in one instance, on p. 17, where this matter is discussed, “endo-plasm” seems to have been printed by mistake). Turning to the chapters on Vertebrata, it will be found that Ridewood's researches on the development of vertebras have been utilised; these, as is pointed out in the preface, “have narrowed the gap between the so-called arco-centra and chordacentra.”

Zoology: An Elementary Text-book.

By Sir A. E. Shipley Prof. E. W. MacBride. Fourth edition. (Cambridge Zoological Series.) Pp. xx + 752. (Cambridge: At the University Press, 1920.) 20s. net.