extrachromosomal systems, and together with chapter 12, which is entitled 

 "Extrachromosomal differences in development", constitute the portion of the 

 book that is of the most immediate interest to developmental biologists. These 

 three chapters together occupy 35 pages. The final chapter discusses extra- 

 chromosomal variation and evolution. 



Each chapter is concluded by a brief list of selected references. The book is 

 illustrated with clear diagrams. There is a combined author and subject index. 



One minor flaw should be pointed out. In fig. 12.2 (erroneously labeled as fig. 2.2) the top 

 and bottom halves have apparently be interchanged. As it is, they do not match the 

 references in the text. 



21 . DIFFERENTIATION AND AGEING OF VEGETATIVE 



NEURONS 

 1965 



by L. I. Korotchkin Izdatelstwo Nauka 



1 88 pp., 62 figs., 2 col. pis., Moscow — Leningrad 



12 tbs. (paper-bound) 



The author of this Russian monograph is a member of the State Medical 

 Institute, Tomsk, Siberia. The book deals with the descriptive and experimental 

 morhology (self-differentiation), cytochemistry, and cytophysiology of the 

 developing and ageing mammalian vegetative nervous system. 



The bibliography covers 22 pages, 10 of which are devoted to Russian 

 authors. The book is illustrated mainly with photomicrographs. 



22. INDUCTION PHENOMENA IN TISSUE REGENERATION 



1964 



by G. Lcvander Almqvist 6 Wiksell 



211 pp.. 67 figs. Stockholm 



The WilHams & Wilkins Cy. 

 Baltimore 



The author of this monograph is a surgeon who has for a long time carried 

 out fundamental research on histogenesis alongside his daily practice. The 

 book is a synthetic review of the studies carried out by him and his associates 

 at Koping Hospital, Sweden, since 1935; in addition, the general biological 

 background of these studies is discussed. 



The main experimental method used by the author and his associates is the 

 "implantation method", in which a fragment of the tissue to be analyzed for its 

 powers of histogenetic induction is transplanted heterotopically in full-grown 

 laboratory mammals, often after massive staining with trypan blue. The 

 implant degenerates and at the same time exerts inductive influences on 

 blastemal cells which come to surround it. The author's main preoccupation 

 has been with bone, but other tissues are also discussed, such as striated 

 muscle, endometrium, gastric mucosa, and skin epithelium. 



The book is opened by two theoretical chapters, dealing with epigenesis and 

 preformation during embryonic development and in tissue regeneration respec- 

 tively. The final chapter is devoted to tumour growth. Throughout the book, 

 much emphasis is placed on theoretical aspects. 



The book is illustrated with photographs, mostly of histological sect'ons. The 

 quality^ of the photographs is seldom excellent. This is in part due to the 



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