the nervous system, the sense organs, and the endocrine glands involved in neuro- 

 endocrine correlation is placed in the perspective of adult function, while for the two first 

 organ systems some basic information on phylogeny is also provided. The main develop- 

 mental anomahes are briefly treated in the text, as well as illustrated. 



The translation is rather clumsy in places. Although the book was printed in France, 

 the photographic illustrations are much less well reproduced than in the original book; 

 some are so dark as to have lost all significant detail. 



Monographs 



42. 



E. BLECHSCHMIDT. 1974. HUMANEMBRYOLOGIE - PRINZIPIEN UND GRUND- 



BEGRIFFE 



Hippokrates, Stuttgart. 127 pp., 138 figs., subject index. DM 64.00 



This book is a sequel to the embryological atlas by the same author which was 

 reviewed in Gen. Embryol. Inf. Serv. vol. 15, part 2, 1975, p. 186. It is in fact an extended 

 discussion of the findings laid down in the atlas and in the author's earlier publications. 

 The starting point is that organs at their very first inception already exhibit principles of 

 differentiation; these are not primarily expressed biochemically, however, but in the form 

 of "developmental movements'" which obey the laws of geometry. In his foreword the 

 author states than an unambiguous, consistent, and therefore unified description of the 

 development of anlagen in terms of their position, shape and structure is only possible if 

 one has a knowledge of the developmental movements of the anlagen in question. 

 Histochemical and biochemical changes are implicit in the developmental movements but 

 do not play a primary or causative role. Development is spatially ordered motion of 

 matter. 



Somewhat surprisingly, the developmental movements are discussed in terms of 

 "Stoffwechselfelder" (metabolic fields). This appears to be a term without much factual 

 content, since the attendant metabolic processes are only discussed in the most general 

 terms and without referring to the literature. The first half of the book discusses such 

 "metabolic fields" during cleavage and in the embryo as a whole. The second half is 

 concerned mainly with organogenesis in the fetus. Here no less than eight main categories 

 of "metabohc fields" are distinguished, which carry the labels of corrosion, densation, 

 contusion, distusion, retension, dilation, parathelial, and detraction fields. What is meant 

 by all these should be read in the original. 



The book is very well produced and, as usual with this author, superbly illustrated. 

 There are no references. 



REPRODUCTION, SEXUAL DEVELOPMENT, GAMETOGENESIS, FERTILIZATION 



(see also 4,19,24,28,60,1 17,120) 



Treatises 



43. 



A. C. GIESE and J. S. PEARSE, eds. 1974/75. REPRODUCTION OF MARINE INVER- 

 TEBRATES 



Academic Press, New York, etc. 



Vol.1 Acoelomate and pseudocoelomate metazoans. XII,546 pp., 184 figs., 14 tabs., 

 author, subject, and taxonomic indexes. $ 38.00, £ 17.85 



Vol. II Entoprocts and lesser coelomates. XIV,344 pp., 115 figs., 10 tabs., author, sub- 

 ject, and taxonomic indexes. $ 36.50 



These are the first two volumes of a 7-volume treatise that for the first time will bring 

 together the widely scattered data on the reproduction of all groups of free-living marine 



207 



