NEW BIOLOGICAL BOOKS 



43 1 



The following topics are then taken up: 

 The constitution of species and natural 

 populations; physiological differentiation; 

 the distribution of allied species; isolation 

 as a factor in the divergence of species; 

 the origin and spread of variant charac- 

 ters; correlation and the origin of groups. 

 There is a bibliography covering 19 pages. 



This book is a contribution of first-rate 

 significance to the literature of evolution. 



PALAEOBIOLOGICA. 



Edited by Othenio Abel (with collaboration of 

 Fritz Drevermann, Otto Jaekel, Franz Baron 

 Nopcsa, and Jan Versluys.~) 



Emil Haim and Co. 

 50 marks (paper) Wien 



53 marks (cloth) 



6f x 9^; iv + 376 

 A Festschrift in honor of Louis Dollo, 

 on the completion of his seventieth year 

 of life. It contains z8 papers on a wide 

 variety of subjects in the general fields 

 of palaeontology, comparative anatomy, 

 and evolution, by distinguished workers 

 on these subjects in various parts of the 

 world. The volume is beautifully printed 

 and illustrated, and does great credit to 

 the publisher as well as to the editor. 

 This Festschrift constitutes the first four 

 parts of the first volume of a new journal 

 to be devoted to palaeontology. 



GENETICS 



DIE ERGEBNISSE DER GENETISCHEN 

 WEIZENFORSCHUNG. 



By Birger Kajanus. Martinus Nijhoff 



5 guilders The Hague 



6| x 9! ; 104 (paper) 



This monograph, published in Biblio- 



graphica Genetica (III, 1927), reviews the 



literature on the genetics of wheat up to, 

 and including, the year 19x4. There is a 

 bibliography of Z14 titles. 



HANDBUCH DER VERERBUNGS- 

 WISSENSCHAFT. Lieferung 1. Band III. 

 Containing following articles: Entwick- 

 lungsmechanik und Vererbung bei Tieren, by 

 W. Schleip, and Partielle Keimesschadigung- 

 en durch Radium und Rontgenstrahlen, by 

 P. Hertwig. 



Gebruder Borntraeger 

 9.60 marks 7 x io|; 1x9 (paper) Berlin 



Since the beginning of this century 

 genetics has reached one of the first places 

 among the branches of biological science. 

 The tremendous growth of genetic litera- 

 ture published in all parts of the world, 

 not only in special journals but in general 

 biological and scientific periodicals, will 

 soon make it really impossible for the 

 average biologist to keep in touch with 

 the progress in the different special lines of 

 this subject. Textbooks on heredity have 

 not the proper dimensions to fulfill this 

 requirement. 



The purpose of the Handbuch planned by 

 Professors Baur and Hartmann is to review 

 the whole field of modern genetics. Up 

 to the present time no such work has been 

 attempted. The material will be divided 

 according to special problems and not 

 according to groups of animals and plants, 

 as was done by Lang (Die experimentelle 

 Vererbungslehre in der Zoologie seit 1900), and 

 by several authors in the well-known 

 Bibliographia Genetica. 



The three volumes of the Handbuch 

 will be made up of thirty-three sections, 

 by twenty-nine collaborators, most of 

 whom are well known German biologists, 

 although the names of H. J. Muller 

 (U. S. A.), J. Nilsson-Ehle (Sweden), and 

 H. Federley (Finland) are included in the 

 list. 



