The author is of the opinion that, before a physico-chemical analysis of 

 development can be attempted, the process should first be completely analysed 

 and classified on the next higher level of integration, i.e. the strictly biological 

 level. Accordingly, his theoretical conclusions are expressed largely in terms 

 of protoplasmic continuity in the organism, geometrical relations of developing 

 territories, localized growth processes, the function of space and cell number, 

 morphogenetic competition between territories, etc. 



The book is in four parts, of which the first deals with cells and cell 

 aggregations, with emphasis on unicellular organisms, colonial Protista, slime 

 molds and sponges. 



The second part, which is by far the largest, discusses vegetative development 

 and regeneration in lower invertebrates and Ascidians. This part contains a 

 wealth of information from many different sources. It is concluded by a short 

 theoretical summary. 



Part three constitutes an excursion into the field of meristematic development 

 in higher plants. Although, of course, by no means exhaustive, it is very 

 valuable because it directs the attention of the zoologist to the existence of 

 parallel processes and problems, of which he is often insufficiently aware. 



Finally, the fourth part presents a selection of those aspects of the develop- 

 ment from eggs, which are especially pertinent to the approach followed in the 

 book as a whole. This part is too incomplete to have much value in itself, and 

 should rather be regarded as an appendix. 



The book is profusely illustrated with good drawings, all especially made 

 or re-drawn by the same artist. The figures have explanatory legends. 

 Systematically arranged bibliographies are given at appropriate places through- 

 out the book. There is a combined author, taxonomic and subject index, of 

 which the subject component could perhaps have been more detailed. 



"INTERNATIONAL REVIEW OF CYTOLOGY'' 

 vols. 10 & 11, 1961 



Editors: G. H. Bourne and Academic Press Inc. 



J. F. Danielli New York and London 



Vol. 10: 423 pp., 107 figs., 19 tabs. Price: Vol. 10: $ 13.00 



Vol. 11: 356 pp., 156 figs., 8 tabs. Vol. 11: $ 11.00 



These are the two latest volumes of an important serial publication containing 

 review papers on a variety of subjects in the field of cellular biology. The 

 reason why the present volumes are announced in the "General Embryological 

 Information Service" is that they contain several contributions which are 

 concerned with developmental biology, viz.: Vol. 10: (1) "The mechanics and 

 mechanism of cleavage", by L. Wolpert, 53 pages; (2) "The growth of the 

 liver with special reference to mammals", by F. Doljanski, 27 pages; and 

 (3) "Epidermal cells in culture", by A. G. Matoltsy, 38 pages; Vol. 11: 

 (1) "Cytology of the developing eye", by A. J. Coulombre, 34 pages; (2) "Use 

 of inhibiting agents in studies on fertilization mechanisms", by Ch. B. Metz, 

 36 pages; (3) "The growth-duplication cycle of the cell", by D. M. Prescott, 

 28 pages; and (4) "Histochemistry of ossification", by R. L. Cabrini, 24 pages. 



All papers contain extensive bibliographies. The books are well printed 

 and well illustrated, and contain author and subject indexes. 



276 



