NEW BIOLOGICAL BOOKS 



303 



non of these present times will be enhanced 

 by this volume. Bertrand Russell is not 

 only an outstanding philosopher in his 

 own right, but he can write more cleverly 

 and melodiously than any other present 

 practitioner in the field of the higher 

 mysteries. This book is first of all a 

 searching critique of theories of knowl- 

 edge, with special attention devoted to 

 the implications in this direction of 

 behaviorism. With much of the behav- 

 ioristic position Russell agrees, but finally 

 breaks with it fundamentally, on a 

 metaphysical point. Having cleared the 

 ground of older theories the author ends 

 with an exposition of the healing virtues 

 of his own eye water. It is a good book; 

 worth buying and studying. 



ZUR PSYCHOLOGY DER TIERE UND 

 MENSCHEN. 



By W. Betz.. Johann Ambrosias Barth 



7.50 marks Leipzig 



6 x 9I; xi -f- zo6 (paper) 

 A wide-ranging discussion of all sorts 

 of human affairs and interests, in the light 

 of comparative psychology. The author 

 writes with vigor and dash, and the book 

 in consequence makes interesting reading. 

 We like his contribution to the eugenics 

 problem, in which it is suggested that if 

 only .the most superior men were not, as a 

 rule, so weak and uncertain sexually they 

 could easily have some hundreds of 

 children apiece, any stupid moral restric- 

 tions being really easily removable, and 

 then there would be some hope of occa- 

 sionally getting an individual as much 

 above Gauss, Faraday, or Kant, for 

 example, as they are above the ordinary 

 university professor, while the average 

 would be raised up to the level of these 

 great men. 



THE SIXTH SENSE. A Physical Explana- 

 tion of Clairvoyance, Telepathy, Hypnotism, 

 Dreams and Other Phenomena Usually Con- 

 sidered Occult. Forty Years of Study, Observa- 

 tion and Experiment. 



By Joseph Sinel. T. Werner Laurie, Ltd. 



6 shillings net London 



4f x 7I; 180 

 This is an entertaining little book. 

 The sense organ for "telepathic" and 

 "clairvoyant" seeing is, according to 

 Mr. Sinel, the pineal body. Children are 

 more clairvoyant than adults because their 

 pineal is bigger, and because the anterior 

 fontanelle is not so tightly closed. Tel- 

 epathy is the response of one brain to 

 molecular vibrations in another. The 

 simultaneous movements of a flock of 

 starlings, for example, are taken as 

 evidence of the occurrence of this phe- 

 nomenon in animals. While it is very 

 weak in spots, we think that most 

 biologists will enjoy reading this volume. 

 There is no law which compels anyone to 

 agree with Mr. Sinel's theory. 



THE MIND OF A GORILLA: PART II. 

 MENTAL DEVELOPMENT. Genetic Psy- 

 chology Monographs, Vol. II, No. 6. 

 By Robert M. Yerkes. Clark University 



$2.. 00 Worcester, Mass. 



6x9; 174 (paper) 

 This second report on the behavior of 

 Congo, the young female gorilla brought 

 from Africa by Mr. Ben Burbridge, 

 maintains the high level of quality and 

 interest set in the first report reviewed in 

 an earlier number of The Quarterly 

 Review of Biology. In the year which 

 intervened between the two studies Congo 

 unquestionably developed mentally. Of 

 particular interest in this volume is the 

 account of the beginnings of her sex 

 behavior. 





