perlmental embryology, but this Is Intentional because the book 

 Is meant for beginners. The only place where It Is a definite 

 drawback Is In the antiquated presentation of the origin of the 

 primordial germ cells. 



The extensive bibliography has been rearranged and much of the 

 older material replaced by more recent titles. The section on te- 

 ratogenesis was greatly expanded. The book Is very well produced 

 and set In a pleasant new type. 



12. 



J.RENOUX. 1971. L'EMBRYON DE POULET (Gallus gallus L. ) 

 Doln, Paris. Travaux Pratiques de Blologle Anlmale, 191 pp.j 

 70 figs. Fr.55.00 (paper) 



This Is a manual to be used In practical embryology courses. 

 The text covers 23 pages and Is concise and straightforward. The 

 early stages receive relatively little attention. The bulk of 

 the book consists of photographs and good schematic line draw- 

 ings. The following stages are Illustrated: cleavage; blasto- 

 derm; gastrula; embryos of I8, 21, 2^ , 28, 33, ^0, ^3> ^8, 56, 

 72, and 96 hours; embryo of 5 days. In later stages particular 

 attention Is devoted to the heart and the circulation. The de- 

 velopment of the cephalic and cardiac regions from 29 to 100 

 hours is Illustrated separately with drawings reproduced from 

 Patten's "Early embryology of the chick". It is surprising that 

 no attempt has been made to correlate the stages with those of 

 Hamburger and Hamilton. 



The photographs of whole mounts stained with eosin are remark- 

 ably good. The quality of the photographs of sections is on the 

 whole less satisfactory, which is partly due to suboptlmal tech- 

 niques of reproduction. All figures are clearly labelled. The 

 book is printed on heavy quality art paper, which has led to a 

 rather high price. 



13. 



R.RUGH. 1971. A GUIDE TO VERTEBRATE DEVELOPMENT. 6th edit. 

 Burgess, Minneapolis. XVI, 351 pp., many figs. $ 6. 50 (spiral bd.) 



This is the sixth edition of the well-known book that used to 

 be called "Laboratory Manual of Vertebrate Embryology". It is 

 now 80 pages longer and was revised with the help of suggestions 

 made by the users of previous editions. 



The major change is the addition of complete series of good 

 photomicrographs of cross sections of six chick and two pig 

 stages. Furthermore, most of the drawings were greatly improved, 

 some f>hotographs replaced and many good new ones added. The chap- 

 ter on the mouse is twice as long as in the previous edition. 

 The glossary has also been revised. 



14. 



Th.W.TORREY. 1971. MORPHOGENESIS OP THE VERTEBRATES. 3rd edit. 

 Wiley, New York, etc. XII, 529 pp., 362 figs., 4 tabs., subject 

 index. £ 5.50 



This text is now so well known that it suffices to briefly an- 

 nounce the third edition. It is essentially the same as the sec- 

 ond, apart from some minor UDdatings and expansions. The in- 

 crease in the number of pages is due less to these than to the 

 use of a somewhat larger type and smaller type area. Forty new 

 Illustrations have been added. The Classification of the Chorda- 

 tes, previously part of the text, is now given as an appendix. 

 The reading lists at the end of each chapter have been revised. 



16 



