pages longer. New chapters were added on gene action in the egg, on cell migration, sorting 

 out and aggregation, and on the migration of primordial germ cells. These show the same 

 excellence of style as the original parts (which were occasionally enlarged). 



The new chapters have illustrations of the same good quality as the others, which have all 

 been retained. A brief list of readings has been added. 



19 



PATTERNS AND PRINCIPLES OF ANIMAL DEVELOPMENT. 1970. By J. W. SAUNDERS Jr. 



Collier-Macmillan, London. 296 pp., 150 figs., 2 tabs., subject index. 90 s. 



Contents: 1) Patterns, problems, and principles, 2) Origin of the fertilized egg, 3) Sorting 

 the materials of the egg: formation of germ layers, 4) Molding the body form, 5) Principles 

 of development: the conceptual framework for developmental analysis, 6) Larval forms and 

 metamorphosis, 7) Regeneration, 8) Genetic control of development, Appendix A: Mitosis and 

 meiosis, Appendix B: Genetic control of protein synthesis 



This book was written mainly for the use of lower-level students who have some elementary 

 knowledge of general biology and chemistry. The text is restricted to the vertebrates and is 

 relatively simple, covering only a minimum of fact and theory. Much of the subject matter 

 has been adapted from the author's "Animal Morphogenesis" (1968), which was reviewed in 

 Gen. Embryol. Inf. Service 13, 1969, p. 316. The favourable opinion expressed at that time 

 also applies to the present book. Its didactic qualities are outstanding. 



Chapters 6 and 7 are entirely new, while the other chapters have been adapted from the 

 previous book. Also new are the two appendixes, and a good glossary of embryological terms 

 and taxonomic names mentioned in the text. Each chapter has a summary emphasizing the 

 principal points covered. The summaries are followed by study questions aimed at stimulating 

 the student's own thought, and by lists of related general readings and works cited in the 

 text. At the end of the book there is a list of books and similar reading matter. 



The numerous illustrations, both photographs and line drawings, are of outstanding quality 

 and unity of style. The figures have sometimes extensive explanatory captions. Type and 

 lay-out of the book are modern and very pleasing, but rather wasteful due to the type area 

 covering only 2/3 of a page. This is reflected in the price. 



Monographs 



20 



ON THE CYTOBIOLOGY OF THE HEN'S EGG (in Bulgarian). 1969. By J. S. JORDANOV 



Publ. House of the Bulgarian Academy of Sciences, Sofia. 343 pp., 39 figs., 7 tabs., English 



summary (13 pp.) 



Contents: I. Evolution (= development) of the hen's oocyte (the yolk) until egg hatching; 

 II. Morphological organization of the ripe hen's oocyte (the yolk); III. Biochemical orga- 

 nization of the ripe hen's oocyte (the yolk); IV. Physiology of the yolk. On the significance 

 of the morphological and biochemical organization of the oocyte (the yolk) for the early 

 embryonic development 



Illustrated with photographs, coloured drawings and black-and-white drawings; bibliography 

 of nearly 800 titles (64 in Russian or Bulgarian). 



Symposium reports 



21 



A DISCUSSION ON DETERMINATION OF SEX. 1970. Edited by G. W. HARRIS and R. G. 



EDWARDS 



The Royal Society, London. Philosophical Transactions of the Royal Society, Ser.B., vol. 259, 



no. 828. 206 pp., 104 figs., 35 tabs. $ 18.20, £ 7 (paper) 



Contributors: Beatty, Chan, Dubois, Edwards, Ford, Fredga, Goy, Harris, Jost, Lyon, Mitt- 

 woch, Neumann, Peters, Polani, Price, Race, Short, Tarkowski 



This issue of the Philosophical Transactions, which is available separately from the Royal 

 Society of London, contains the proceedings of a Discussion held in London in May 1969. The 



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