we will review, apart from mentioning that the book has a final 

 chapter on mechanisms of sex determination in man. 



The study is based on over 300 human emoryos collected by the 

 author. A table based on this material is presented, which cor- 

 relates crown-rump length and Streeter horizons with gestational 

 age estimated from anamnestic data. Part one has the following 

 chapters: Germ cells; Development of the testis (including a 

 section on the Interpretation of gonadal development); Develop- 

 ment of the genital ducts (male and female); Development of the 

 external genitalia (male and female; including sections on in- 

 tersex malformations and on the classification of genital malfor- 

 mations) . 



The study Is documented with 28 photomicrographs of sections 

 (many stained with histochemical procedures), 25 photographs of 

 the genitalia of whole and dissected embryos, and 20 photographs 

 of malformed external genitalia as seen after birth. 



The book is well printed and has a bibliography of l6 pages. 



Dissertations 



79. 



J.BIERNE. 1970. RECHERCHES SUR LA DIPFERENCIATION SEXUELLE AU 



COURS DE L'ONTOGENESE ET DE LA REGENERATION CHEZ LE NEMERTIEN 



LINEUS RUBER (MULLER) 



Ph.D. thesis, Reims. Ann. Sci .Nat . ,Zool .Biol .Anlm. , 12e Ser., 



Tome 12, fasc.3. pp.l8l-298, 24 figs., 26 pis., l6 tabs. 



Descriptive and experimental study on larval, juvenile, and 

 immature adult worms; parabiosis and regeneration; demonstration 

 of a gonad-inhibiting hormone produced by the brain, and of an 

 androgenic hormone from the testis; study of secondary sex char- 

 acters (cutaneous glands). 



80. 



L.BOISSIN. 1970. GAMETOGENESE AU COURS DU DEVELOPPEMENT POST- 



EMBRYONNAIRE ET BIOLOGIE DE LA REPRODUCTION CHEZ HYSTEROCHELIFER 



MERIDIANUS (L.KOCH) (Arachnides, Pseudoscorpions ) 



Ph.D. thesis, Montpellier. 210, XXXIII pp . (mimeograohed) , 25 figs., 



24 pis. 



Thorough study, containing data on postembryonic development 

 and reproductive biology, but with emphasis on development of 

 male genital system and ovary, spermatogenesis, and oogenesis; 

 illustrated with good line drawings and numerous good photo- and 

 electron micrographs. 



PLANT DEVELOPMENT (general) (see also 1,62) 



Textbooks 



81. 



M. BLACK and J.EDELMAN. 1970. PLANT GROWTH 



Harvard Univ. Press, Cambridge, Mass . X,193 pp., 75 figs., l6 pis., 



3 tabs., subject index. $ 4.25 



The title of this book might be misleading, because it deals 

 not only with quantitative growth, but also with differentiation 

 and general aspects of morphogenesis. The book is meant as an in- 

 troduction to the field for beginning students, and is character- 

 ized by excellent style and great didactic clarity. Although the 

 treatment is not exhaustive, all major aspects of the subject are 

 treated on a contemporary level. The emphasis is on processes 

 rather than facts, and on principles of interaction and Integra- 



44 



