nucleus as vehicle of inheritance (papers by Strasburger, Hertwig, and Weis- 

 mann); IV. The continuity of chromosomes (papers by Flemming, Roux, Van 

 Beneden, and Weismann); V. The individuality of the chromosomes (papers 

 by Montgomery, McClung, Boveri, Sutton, Wilson, and Stevens); VI. Men- 

 del (one paper and two letters by Mendel); VII. Mendelian genetics and the 

 chromosome theory of inheritance (papers by Sutton, Carothers, Morgan, 

 Sturtevant, Bridges, Blakeslee, and Dobzhansky). 



The book has a thoughtful preface and is well produced. 



12 LABORATORY STUDIES OF CHICK, PIG AND FROG 



EMBRYOS 

 2nd. edit.. 1970 

 by R. L. Watterson and R. M. Sweeney Burgess Publishing Comp., 



184 pp., 9 figs., 38 pis. Minneapolis, Minn. 



SBN 8087 2326 X 

 Price: $ 6.50 



The second edition of this well-known laboratory guide (first printed in 

 1955) has been thoroughly revised. However, the basic plan has been retained. 

 The two major improvements are the addition of a section on the early 

 development of the frog, and the inclusion of a large number of photographic 

 illustrations. The number of text figures was increased to nine. 



Of the 38 plates 21 relate to the chick embryo, 14 to the 10-mm pig embryo, 

 and 3 to the frog (blastula, gastrula, and 4-mm embryo). The pig and frog 

 illustrations are all serial or single sections. The chick illustrations cover the 

 18, 24, 33, 48, and 72-hour embryo. Many of them represent whole mounts, 

 some of them injected to show the blood vessels. 



All illustrations are of high quality and are well reproduced. The book is 

 printed in offset, which is a great improvement over the first edition. 



13 PRINCIPLES OF DEVELOPMENT 



A text in experimental embryology 

 1969 (facsimile reprinting) 

 by P. Weiss Hafner Publishing Comp. 



672 pp., 124 figs. New York 



Price: $ 17.50 



An unrevised reprinting of this book, originally published in 1939, is amply 

 justified by the fact that it has been epoch-making in a field which to-day 

 enjoys a renewed world-wide interest: developmental biology. 



The original book is reprinted in facsimile, but the author has added a new 

 foreword, in which he gives his reasons for acceding to this reprinting, and 

 an appendix which takes the form of a lengthy "Essay on hierarchically 

 organized systems" (43 pages). In this essay he considers organisms (and 

 more particularly the developing organism) from the viewpoint of system 

 theory. It is a very thoughtful contribution, written with utmost clarity, and 

 points out many of the pitfalls of contemporary biological thinking, not least 

 those resulting from careless use of language. The essay will be read with 

 profit by advanced biology students, and indeed by all biologists, develop- 

 mental or otherwise, who want to deepen their insight into what their research 

 is about: the organism as a dynamic system. It should be particularly useful 

 to all those entering the field of theoretical biology. 



The book is produced with great care. 



17 



