432. 



THE QUARTERLY REVIEW OF BIOLOGY 



The content of the Handbuch is broader 

 than the title implies. The last volume 

 will contain sections on evolution, the 

 phylogeny of animals and plants, and the 

 origin of domesticated animals and plants. 

 A number of sections will be devoted to 

 the applications of genetics: eugenics, and 

 plant and animal breeding. When fin- 

 ished the Handbuch will be an indispens- 

 able reference book in the libraries of 

 university biological laboratories, ex- 

 periment stations, and individual workers 

 in the fields of human, animal, and plant 

 heredity. 



The first section, now published, pre- 

 sents an attempt to connect the modern 

 science of heredity with Entwicklungs- 

 mechanik — the physiology of development. 

 It must be admitted that there is an 

 obvious difficulty in correlating the two 

 lines of investigation: the highly de- 

 veloped genetic theory, which permits us 

 to predict with a very great degree of 

 accuracy the characteristics of progeny in 

 our hybridization experiments, on the one 

 hand, and, on the other, an understanding 

 of the mechanism by which the genes 

 control the development of a growing 

 organism. 



The second part, written by Dr. Paula 

 Hertwig, discusses one of the most 

 interesting problems of present day gene- 

 tics. It deals not only with the influence 

 of radium and Rontgen rays, as may be 

 learned from the title, upon the germ cells, 

 but includes also a short review of experi- 

 ments with other agencies. It should be 

 noted that the discussion of the latter is 

 far from complete. For instance, the 

 well-known, although not entirely con- 

 clusive, temperature experiments of 

 Standfuss, Fischer, etc., are not even 

 mentioned. We should also prefer not 

 to use the term "Keimesschadigungen" in 

 describing the experiments on the influence 

 of external agencies upon the germ cells, 



because it implies a certain amount of 

 subjective judgment of the harmfulness of 

 the effect. A neutral term Keimesbeeinfluss- 

 ungen, would be preferable. 



ENTSTEHUNG DER HAUSTIERE. 



Handbuch der Vererbungswissenschaft. Lief- 

 erung z (III t K) 



By B. Klatt. Gebriider Borntraeger 



15 marks 7 x io|; 107 (paper) Berlin 

 This number of the Baur-Hartmann 

 Handbuch is devoted to a thorough dis- 

 cussion, well illustrated, of the origin of 

 the common domesticated animals, and of 

 the modifying effects of domestication 

 upon their structures and functions. 

 There is a bibliography of eight pages. 



THE PROSPECTIVE DEVELOPMENT 

 OF PERU AS A SHEEP-BREEDING AND 

 WOOL-GROWING COUNTRY. 



By Aldred F. Barker. Granja Modelo Puno 



Chuquibambilla, Peru 



7! x 9f; xii + 174 (paper) 



A report to the Peruvian government, by 



the Professor of textile industries at Leeds, 



which is of considerable interest and value 



to students of the genetics of sheep and 



wool. 



GENER AL BIO LOGY 



LA CONQUETE DE LA VIE. 



By Serge Voronoff. Eugene Fasquelle 



12. francs 4! x -j\\ zz8 (paper) Paris 

 In his latest volume Dr. Voronoff says 

 about the same thing over again about his 

 rejuvenation technique. We like the 

 author's ideal, even if we are sceptical 

 about its realization through testicular 

 transplantation: "L'ideal vers lequel ten- 

 dent nos efforts, c'est de conserver la vie 



