enrichment; 11. Infantile stimulation; 12. Maternal influen- 

 ces; 13. Social factors 



This book of readings is concerned entirely with postnatal be- 

 haviour in mammals and man. It has been organized in such a way 

 that broad principles can be derived which apply to animals and 

 humans alike. In each chapter the papers reporting on human 

 studies illustrate the same principles as the papers dealing 

 with animal experiments. Of the 65 papers, 21 deal with the hu- 

 man, 23 with the rat, and 21 with four other mammalian species. 

 Each of the chapters 2 to 13 consists of between four and seven 

 short to medium-length papers. Sometimes somewhat older papers 

 were intentionally selected rather than very recent ones. 



Ch.l is a lengthy and thoughtful introduction to the entire 

 field covered by the book, and has its own references. Each 

 chapter is opened by a very good introduction of a few pages, 

 with separate references, in which the readings are placed in 

 proper perspective and briefly characterized. Together these 

 introductions provide an excellent brief survey of the field. 



DEVELOPMENTAL GENETICS, EVOLUTION (see also 1,6,10,17,21-23,35, 



43, 47, 49, 56, 83, 9 8, 102, 104-1 07, 116, 132) 



Textbooks 



117. 



J.B.GURDON. 1973. GENE EXPRESSION DURING CELL DIFFERENTIATION 

 Oxford Univ. Press, London, etc. Oxford Biology Readers no. 25. 

 16 pp. , 17 figs. 20p. 



This is a highly competent, well-written and well-illustrated 

 review of an important field of enquiry. The only odd point is 

 the statement on the first page that "There is no known way of 

 making a cell committed to one kind of differentiation change 

 into a cell of another kind". One immediately asks: What about 

 lens regeneration from the iris in the eye of urodeles? This 

 phenomenon, admittedly the only well-established case of cellu- 

 lar metaplasia in a vertebrate, is not mentioned in the text. 



There are a number of confusing printing errors. 



Monographs 



118. 



W.BEERMANN, ed. 1972. DEVELOPMENTAL STUDIES ON GIANT CHROMOSOMES 

 Springer, Berlin, etc. Results and problems in cell differentia- 

 tion Vol.4. XVI, 227 pp., 110 figs., 14 tabs. DM 59.00, $ 18.70 



Contents: 1. Chromomeres and genes (Beermann); 2. Chromosomes 

 isolated from unfixed salivary glands of Chironomus (Lezzi and 

 Robert); 3. Replication in polytene chromosomes (Rudkin); 4. 

 Transcription in giant chromosomal puffs (Pelling); 5. Puffing 

 patterns in Drosophila melanogaster and related species (Ash- 

 burner); 6. Relation of puffing to bristle and footpad differ- 

 entiation in Calliphora and Sarcophaga (Ribbert); 7. The con- 

 trol of puffing in Drosophila hydei (Berendes); 8. Balbiani 

 ring activities in Acricotopus lucidus (Panitz) 



The editor of this new volume of a successful series states 

 in his preface that he has not aimed at completeness. The table 

 of contents shows that this is so, but the contributors who have 

 been selected are all recognized authorities in the field and 

 have provided well-organized, well-written, and up-to-date re- 

 views which nobody even remotely interested will want to miss. 



232 



