31 



logical, descriptive embryological and experimental embryological viewpoints. 

 Naturally the discussions centre around mammalian (more especially human) 

 development. The most important results of the experimental embryology of 

 the vertebrate nervous system are expounded in an introductory contribution 

 by Prof. Et. Wolff (23 pages). 



Each contribution is followed by a bibliography. The book contains many 

 illustrations (chiefly photographs). 



Authors o[ papers: Ajuriaguerra (Paris), Ariens Kappers (Groningen), Bargeton (Paris), 

 Bonis (Paris), Durcux (Nancy), Eicke (Marburg/Lahn), Feld (Paris), Foncin (Paris), 

 Frauchigcr (Bern), Frezal (Paris), Girard (Lyon), Giroud (Paris), Gros (Montpellier), 

 Gross (Vienne), Gruner (Strasbourg), Heuyer (Paris), Hoff (Vienne), Jacob (Hamburg), 

 Kissel (Nancy), Labauge (Montpellier), Lafon (Montpellier), Lamy (Paris), Lund (Bonn), 

 Minkowski (Zurich), Thomas (Paris), Tridon (Nancy), Tusques (Nantes), Vlahovitch 

 (Montpellier), Wolff (Paris), Ziilch (Cologne). 



'DAS FORMPROBLEM IN DER BIOLOGIE" 

 1958 

 by H. Homma Springer Verlag 



50 pp., 2 figs. Wien 



(paper bound) Price: $ 1.20 



The content of this essay is of mainly theoretical significance. On the basis 

 of data supplied by developmental mechanics the author speculates about what 

 he calls "formative energy"! ), which would be responsible for the establishment 

 of form in organisms. This formative energy would show a maximum in the 

 zygote, and a minimum in somatic cells of higher animals. Criteria are given 

 for the establishment of the level of formative energy in various types of cells. 

 Formative processes are distinguished from proliferative processes. Tumour 

 cells would be characterized by presence of the latter and absence of the 

 former. 



"NORMAL AND ABNORMAL DIFFERENTIATION 

 AND DEVELOPMENT" 

 1960 

 Editor: N. Kahss National Cancer Institute 



(National Cancer Institute Bethesda, Md. 



Monograph, no. 2) Price: $ 1.25 



187 pp., 9 pis. 



The present monograph embodies the proceedings of a Symposium held at 

 Bar Harbor, Maine, in June, 1959, on the occasion of the 30th anniversary of 

 the Roscoe B. Jackson Memorial Laboratory. The Symposium was in three 

 sessions. The first session contains papers on "Biochemical embryology and 

 genetics", on "Disaggregation and reaggregation of early chick embryos", and 

 on "Metabolic mechanisms of teratogenic agents during morphogenesis". The 

 second session ("Immunology") contains, among other things, a paper on 



1) a vague concept hardly open to causal analysis (the reviewer). 



