The numerous line drawings are on the whole satisfactory, but most of the photo- 

 graphs are not well reproduced. The caption of fig. 5.3 fails to point out that this is an 

 egg cleaving without the vitelline membrane. The 24-page bibliography runs up to 

 1972/'73; an addendum lists some 20 more titles from 1972-'74, which have been 

 incorporated into the text. 



33. 



A. DJANASHVILI, ed. 1975. SOME PROBLEMS OF DEVELOPMENTAL BIOLOGY 



OF ANIMALS, Vol. 1 (in Russian) 



Tbilisi Univ. Press, Tbilisi. 208 pp., 30 figs., 3 tabs. 



Summary by Chanturishvili and Goshkheteliani of unorthodox results on the putative 

 genetic and epigenetic role of albumen in avian development; theoretical paper by 

 Chanturisvih on the role of extra-embryonic materials in development; English summa- 

 ries. 



Dissertations 



34. 



M. A. VEINI-HARITOS. 1975. EXPERIMENTAL STUDIES ON THE DIFFERENTIA- 

 TION OF HENSEN'S NODE IN THE CHICK EMBRYO (in Greek) 

 Ph.D. thesis, Athens. 125 pp., 27 figs., 5 tabs. (1-page English and French summaries) 



The essential results of this thesis have been pubUshed in Wilhelm Roux' Arch. Devel. 

 Biol. 7 77,89-100 (1975). 



Symposium reports 



35. 



G. J. THORBECKE, ed. 1975. BIOLOGY OF AGING AND DEVELOPMENT 



Faseb, Bethesda; Plenum, New York, etc. Faseb Monographs Vol.3. VIII, 344pp., 

 143 figs., 39 tabs., subject index. $ 30.00, £ 13.25 



This is the report of a series of symposia held in 1974 and first published in Federation 

 Proceedings 34, nos. 1 and 2. Of the 37 speakers three each were from Canada and 

 England, the remainder from the U.S.A. The papers are short to medium-length reviews 

 intermingled with occasional research reports. The immune system takes pride of place as 

 a model of organogenesis, although other systems are also considered. 



Of the six symposia, three contain much material of interest to developmental 

 biologists. They are entitled respectively: Theoretical concepts of developmental and age 

 changes (3 papers, among them a compact but lucid one by Wolpert and Lewis); Gene 

 regulation in differentiation and development (6 papers, all on the immune system); 

 Development and aging in organ systems (6 papers, all on the immune system). One of 

 the other symposia dealt with finite vs infinite proliferative and functional capacities of 

 cells, mostly in vitro. 



The book is well produced and illustrated. 



Collections of papers 



36. 



R. COURRIER, preface. 1975. EMBRYOLOGIE CHIMIQUE ET EXPERIMENTALE, 



resultats recents 



Masson, Paris. VI, 400 pp., 35 figs., 15 pis., 9 tabs. 



This Festschrift for Et. Wolff is a reprinting from L'Annee Biologique, ser. 4, vol. 13, 

 1974. Of the 40-odd articles it contains, a few are brief essays, the remainder either 



189 



