POURREAU (SCHNEIDER). Mrs.N.M. B.A.. Dr. — Inst. d'Embryol. et 

 Teratol. exper. du C.N.R.S., 49bis Avenue de la Belle Gabrielle 

 NOGENT sur Mame (Seine), France 



— Lab. d'Embryol. exper. du Coll. de France, 11 Place Marcelin Ber- 

 thelot, PARIS Ve, France 



a. Culture in vitro of adult chick organs as a medium for the prolifer- 

 ation of cancers from another species. 



b. In vitro studies on hematopoiesis in embryonic and adult spleen and 

 bone marrow. (Aues; Mammalia) 



POURTOIS, M. M.D., Lic.en Sci.dent. — Lab. d'Anat. et d'Embryol, Fac. 



de Med. de I'Univ., 97 Rue aux Laines, BRUXELLES-Auderghem. 



Belgique 

 PRASAD. M.R.N. M.Sc. Ph.D., Prof. — Dept. of Zool., Univ. of Delhi, 



DELHI 7, India 



a. Delayed implantation studies. Cricetus auratus, Rattus spec. (Rodentia) 



b. Morphogenesis and cytochemistry of foetal membranes. Funambulus 

 spec, Tatera indica cuvierii (Rodentia) 



c. Physiology of reproduction. Hemidactylus spec. (Lacertilia), Funambulus 

 spec. (Rodentia), Pteropus. spec. (Megachiroptera) , Loris spec. (Prima- 

 tes) 



PRAY, T.R. B.A.. Ph.D., Prof. — Dept. of Biol.. Univ. of Southern Califor- 

 nia, University Park, LOS ANGELES, Calif.90007. U.S.A. 



a. Development of the gametophytes and juvenile stages of the sporophy- 

 tes. (Cheilantheae, Pteridaceae) 



b. Development of the vein systems of leaves. Anemia spec, Marsilea spec, 

 Cyrtomium spec, Acrostichum spec, and other spp. (Ptecydophyta) 



c Development of the dichotomous venation of the leaf. Ginko spec 

 PREDA, V. M.D., Prof. — Catedra de Biol., Inst. Medico-Farmaceutic, Str, 



Pasteur 6, CLUJ. Rumania 

 a. Influence de la temperature d'incubation sur le metabolisme de I'oeuf. 



Gallus spec (Aves) 

 h. Histochimie des organes embryonnaires cultives in vitro. Gallus 



spec (Aves) 

 c Influence de I'hormone gonadotrope choriale sur la gonade indifferen- 



ciee cultivee in vitro. Gallus spec (Aves) 

 PRESCOTT. D.M. B.A.. Ph.D., Prof. — Dept. of Biol., Univ. of Colorado, 



BOULDER, Colo., U.S.A. 

 a. Nuclear-cytoplasmic interactions studied by RNA migration, histone 



turnover and locaUzation of nonhistone protein tumovex exchange. 



Amoeba proteus (Amoebina) 

 h. Subunit organization of chromosomes revealed by nonrandom exchange 



(exchange spots) of sister chromatids. Microcricetus auratus (Rodentia) 

 c Initiation and localization of DNA synthesis in relation to amino acids, 



nucleosides and nucleokinases. Tetrahymena pyriformis, Euplotes eury- 



stomatus (Ciliata) 

 PRESLEY, R.S. M.A., M.B., B.Chir. — Anat. School, Univ. of Cambridge, 



CAMBRIDGE, England 

 a. Tissue culture and organogenesis. (Mammalia) 

 PRESS. N. B.S., M.S.. Ph.D.. Prof. — Dept. of Zool., Univ. of Wisconsin- 

 Milwaukee. MILWAUKEE, Wis.53211. U.S.A. 



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