to separate anuran-avian and urode Ian-mammalian lines, with the reptiles 

 possibly being divided among the two lines. 



The probability of an epigenetic origin of the primordial germ cells in 

 several chordate groups of course raises the problem of the significance of 

 the germinal cytoplasm as a true germ cell determinant. This problem is ex- 

 tensively discussed, the conclusion being that such a role is very unlikely 

 even in the "classical" case of the anurans. 



The bibliography contains close to 600 titles and is up to date until 

 1976/77. The book is well produced and illustrated with very good, mostly 

 original line drawings and some good photographic plates. 



41. 



B.-M.UEBELE-KALLHARDT. 1978. HUMAN OOCYTES AND THEIR CHROMOSOMES, an atlas 



Springer, Berlin, etc. X, 106 pp., 53 figs., subject index. DM 48.00, $ 24.00 



This beautiful atlas is the result of years of patient work. It is in two 

 main sections, the first of which deals with the stages of first meiotic 

 prophase as observed in stained, air-dried nuclear preparations from ovaries 

 of fetuses aged 18 to 27 weeks. For the second section, dealing with the 

 first and second meiotic divisions, the nuclei were obtained from oocytes 

 taken from adult ovaries and allowed to mature in vitro. The material is a 

 selection from more than 2,000 cultured oocytes. 



The emphasis is on normal processes in the nucleus and on normal karyo- 

 types, but some structural abnormalities are also illustrated (formation of 

 a quadrivalent, chromosome stickiness and clumping) . Brief texts accompany 

 the plates. There is a separate section on materials, methods and terminol- 

 ogy. Each section has an up-to-date list of selected references. The book 

 has been produced with the utmost care. 



Dissertations 

 42. 



C.PALEVODY. 1976. L'OVOGENESE CHEZ LES COLLEMBOLES ISOTOMIDES. CYTOLOGIE ET 



APPROCHE PHYSIOLOGIQUE 



Ph.D. thesis, Toulouse. 133 pp., 25 figs., 66 pis., 5 tabs, (mimeographed) 



Very thorough study on several species of Isotomids, particularly Folsomia 

 Candida, against a background of reproductive biology; peroxydase as a pro- 

 tein tracer; cytology of oogenesis; factors involved in ovarian cycle; par- 

 thenogenesis; line drawings and numerous excellent light and electron micro- 

 graphs. 



May be borrowed from the Central Embryological Library, Hubrecht Labora- 

 tory, Uppsalalaan 8, 3 584 CT Utrecht (Netherlands) 



43. 



J.A.B.M.THEUNISSEN. 1976. ASPECTS OF GAMETOGENESIS AND RADIATION PATHOLOGY 



IN THE ONION FLY, Hyleraya antiqua (Meigen) . I GAMETOGENESIS 



D.Agr. thesis, Wageningen. 164 pp., 85 figs., 10 tabs. 



Thorough study of gametogenesis with emphasis on spermatogenesis and 

 testis development; cytology, histology, autoradiography, electron micros- 

 copy; comparative spermatogenesis in 9 other insect species from 7 orders; 

 oogenesis and ovarian development studied for comparison; excellent line 

 drawings, light and electron micrographs. 



May be borrowed from the Central Embryological Library, Hubrecht Labora- 

 tory, Uppsalalaan 8, 3584 CT Utrecht (Netherlands) 



219 



