ficiently characterized by the table of contents printed above. An important feature of the 

 present edition is that all chapters have been updated by means of sometimes lengthy addenda, 

 describing the most important work published from 1963 till 1968. 



The numerous original illustrations are reproduced, while the addenda have their own new 

 illustrations. Many of the illustrations are photographs which are very well reproduced, 

 sometimes better than in the original. The translation is due to the "Express Translation Ser- 

 vice"; it is satisfactory, although clumsy in places, and clearly not done by a person trained in 

 biology. 



The book is well printed on heavy quality glossy paper. It has a subject index, but the ab- 

 sence of an author index is badly felt. Surely this could have been provided at a slight 

 increase in price, making the book much more useful as a work of reference. 



66 



TISSUE INTERACTIONS DURING ORGANOGENESIS. 1970. Edited by Et. WOLFF 

 Gordon and Breach, New York. Documents on Biology vol. 1. 239 pp., 95 figs., 10 tabs.. 16 

 pis., author index. ISBN 677 13010 4, $ 21.00, £ 8.15 (cloth). ISBN 677 13015 5, $ 7.50, 

 £ 3.2.6. (paper) 



This is the English translation of a book published in French in 1969. The French version 

 was reviewed in Gen. Embryol. Inf. Serv. 13, 1969, p. 338. The English translation is good, 

 although not idiomatic. One contribution, that by Tiedeman, was left out of the present book, 

 so that authorship is now entirely confined to members or former members of the school of 

 Et. Wolff in Paris, and the experimental material to the chick embryo. 



No attempt has been made to update the various contributions. Since the original series 

 of seminars was held in 1967, this means that the most recent advances are not included. 

 Nevertheless, it is very convenient for English-speaking readers that all this important material 

 is now available in concise and coherent form in English. 



The book is very well printed and illustrated. It has no subject index. The price of the 

 paperback edition is reasonable. 



Cellular Developmental Biology (see also 14, 16, 20, 59, 61, 81, 82, 85, 86, 96) 



Treatises 



67 



CELL DIFFERENTIATION. 1970. Edited by O. A. SCHJEIDE and J. DE VELLIS 



van Nostrand Reinhold, New York. 622 pp., 204 figs., 26 tabs., subject index. £ 10.— 



Contents: I. General concepts 1. Introduction, 2. Molecular differentiation in primordial 

 systems, 3. Theoretical considerations regarding cell differentiation; II. Molecular biology 

 4. Informational molecules and differentiation, 5. Transcriptional patterns during differen- 

 tiation, 6. Cellular and molecular events associated with mitosis and meiosis, 7. Nuclear- 

 cytoplasmic transfers, 8. Translocation of macromolecules, 9. Biomembrane synthesis and 

 assembly; IN. Biochemistry and metabolism 10. Senescence: cell biological aspects of aging, 

 11. Enzyme regulation during cell differentiation, 12. Specific macromolecular changes 

 during development; IV. Molecular and structural differentiation of cells 13. Ultrastructural 

 differentiation, 14. Organelle synthesis and assemoly, 15. A model for erythrocyte differen- 

 tiation, 16. Estrogen-directed ^differentiation of the avian liver, 17. Myogenesis, 18. Induction 

 and differentiation of cartilage and bone cells, 19. Neural cell differentiation, 20. Differen- 

 tiation in plant cells 



The word "differentiation" has two accepted meanings, one spatial, the other temporal. 

 Spatial differentiation is also called arealization or pattern formation, while temporal differen- 

 tiation is more or less synonymous with cyto- or histogenesis. The present book is almost ex- 

 clusively about the temporal differentiation of cells, of which much more is known in terms 

 of structure, chemistry, and physics. In fact, the book may be considered as dealing with the 

 long-term temporal aspects of cell biology, rather than with a particular aspect of embryology. 

 Accordingly, the definition of differentiation from which it starts is very broad indeed, and 

 not restricted to processes occurring in embryonic cells. 



The book is intended primarily for advanced students, instructors, and active investigators. 

 It was written by 23 specialists, all of them North-American. It is impossible to review it 



348 



