171 



The value of this textbook can only be determined in its planned educational 

 system together with the special system of lecturing and particularly in 

 combination with the extensive use of demonstration material and motion 

 pictures, of which latter a rather extensive list has been added. 



Short hsts of references have been added at the end of each chapter; each 

 reference with a brief review, which actually helps the student to find his 

 way to the more detailed and extensive sources of information. A general 

 shortcoming of this textbook is its rather static character; the dynamic aspects 

 of histology and microscopical anatomy, in the form of e.g. the cychc changes 

 and the processes of transformation during normal growth and during 

 regeneration have been insufficiently focussed. 



P. D. NIEUWKOOP 



„ENTWICKLUNGSPHYSIOLOGIE DER INSEKTEN" 

 1952 



by O. Pflugfelder Probleme der Biologie, Band 5 



332 pp. with 126 figs Geest & Portig K.-G. 



Leipzig 



This is the first attempt to give a survey of the entire field of insect 

 development only with a more summary treatment of the action of external 

 factors and the general physiology of the developing insect. 



According to the author a rather extensive treatment of the morphogenetic 

 processes is necessary for the right appreciation of the physiological aspects 

 of development. The third chapter treats he organogenesis during embryo- 

 have been brought together in one textbook. 



The subject has been treated chronologically starting with the primitive 

 development. The morphological aspects are discussed first, after which the 

 physiological problems are given according to the regulative, the partly 

 regulative and partly determinative, and the pronounced determinative types 

 of development. The third chapter treats the organogenesis during embryo- 

 logical and post-embryological stages, while the last chapter of this book is 

 devoted to the extensive field of hormonal actions during post-embryonic hfe. 



We feel that this attempt to bring together the morphological and physio- 

 logical aspects of development is of very great importance in order to bridge 

 the gap between these often separated fields of research, in order to under- 

 stand that form and function are a unity which cannot be spht into separate 

 parts. 



The concise text of this book which is so clearly written, has been illustrated 

 with a large number of clear figures, which makes it even more easily readable. 



The very rich bibhography forms an excellent guide in this very extensive 

 literature, so that we can highly recommend this textbook to advanced students. 

 It moreover forms an excellent source for literature for embryologists interested 

 in problems of morphogenesis and developmental physiology of insects. 



We, therefore, hope that this german textbook might also find its way in 

 many countries of other continents. 



P. D. NIEUWKOOP 



