control"; it contains chapters on genes and their functions, gene control in 

 bacteria, gene control in animals, hormones and gene control, processes of dif- 

 ferentiation, and mechanisms of immunity. Part II deals with genes and cancer. 



The illustrations are for the greater part simple but clear diagrams. There is a 

 selected list of references for each chapter, and a combined author and subject 

 index. 



2 EVOLUTIONARY TRENDS IN HETEROPTERA 



Part I. Eggs, architecture of the shell, gross embryology and eclosion 



1968 



By R. H. Cobben Centre for Agricultural Publishing 



475 pp., 316 figs., 2 tbs. and Documentation - Wageningen, Neth. 



Price: H.fl. 55.— 



This monumental monograph is essentially a biotaxonomic study, but it 

 contains such a wealth of data on the structure and biology of Heteropteran eggs 

 that it is undoubtedly of interest to specialists in insect embryology. Some 400 

 species representing almost all families of the Heteroptera were studied; eggs 

 were obtained either from living animals or from museum specimens. 



In the careful descriptions attention is paid to egg shape and mode of ovi- 

 position, architecture of the chorion, gross embryogenesis, dynamics of eclosion, 

 bilateral asymmetries in the fully grown embryo, and the polarity of the egg 

 system. Incubation periods, diapause phenomena, and reproductive cycles are 

 summarized. The embryological data are compared with the literature dealing 

 with other insect Orders. 



The book is profusely illustrated with beautiful drawings and photographic 

 plates; it has an extensive bibliography, and author and subject indexes. 



3 NUCLEUS AND CYTOPLASM 



1968 

 By H. Harris Clarendon Press 



1 57 pp.. 8 figs., 1 6 pis., 1 tb. Oxford 



Price: (U.K.) 30 s. 



Contents: 1. The expression of genetic information; 2. The genetic operator model; 3. The 

 search for the messenger; 4. Regulation; 5. Hybrid cells; 6. Differentiation. 



The object of this book, based on a series of lectures, is to provide an in- 

 troduction to some of the salient problems in the field of biochemical nucleo- 

 cytoplasmic relationships. The author has been an active worker in this field, 

 and is noted particularly for his pioneer work on somatic cell hybridization in 

 vitro. 



The approach followed in this book is analytical rather than didactic. The 

 discussion is based to a large extent on the author's own experiments on Aceta^ 

 bularia, bacteria, and animal cells; the style is highly personal, and the ideas 

 expressed are unorthodox and thought-provoking. The book is pervaded by a 

 sceptical attitude towards the widely, and, the author believes, often uncritically 

 applied Jacob-Monod operator model for enzyme synthesis in E, coli. The author 

 defends the thesis that in most cells protein synthesis is regulated in the cyto- 



13 



