Pie 71 Que 



PIEPHO, H. Dr Phil.. Prof. — Zool. Inst, der Univ. Gottingen, Mathem.- 

 Naturw. Fak.. Nikolausbergerweg 75, GOTTINGEN, Deutschland. 

 a. Metamorphose. Galleria mellonella (Lepidoptera) 



PINCUS, G. Dr, Prof. — Worcester Foundation for Exper. Biol., 

 222 Maple Ave. SHREWSBURY, Mass.. U.S.A. 



a. Physiology of reproduction. (Mammalia) 



b. Early development of eggs. (Mammalia) 



PISANO. A. Dr. Biol. Sc. — Inst, de Zool., Univ. Nac. de Tucuman, Miguel 



Lillo 205, TUCUMAN, Argentina, S. America. 



(no data received over some years) 

 PLANQUE, B. A. de M.Sc. — Hubrecht Lab., Internal. Embryol. Inst.. 



Janskerkhof 2. UTRECHT, Holland, 

 a. Regulation potencies in the neural plate. Formation of neural crest by 



regulation after implantation of young neural plate tissue in the ventral 



side of neurulae, or by homogenetic induction after implantation in 



middle gastrulae (heteroplastic transplantation). Tritutus taeniatus, 



alpesttis and cristatus (Ucodela) 

 PLETZEN, R. van D.Sc. (Stellenbosch) — Dept of Zool., Univ. of O.F.S.. 



BLOEMFONTEIN. South Africa. 

 a. Ontogenesis of skeleton and muscles of shoulder girdle and forelimbs. 



Xenopus laevis (Anura) (Normal Table) 

 PORTMANN. A. Dr Phil., Prof. — Zool. Anstalt der Univ., Rheinsprung 



9, BASEL, Schweiz. (no embryological work in progress) 



POULSON. D. F. Ph.D., Prof. — Osborn Zool. Lab.. Yale Univ.. NEW 



HAVEN 11, Conn., U.S.A. 



(no data received over some years) 

 PRETO PARVIS, Mrs V. Dott. Med.. Prof. — 1st. di Anat. umana norm. 



dell'Univ. di Milano. Via Mangiagalh 31, MILANO, Italia. 



a. Modifications of contents in nucleinic acids and of the nuclear apparatus 

 in nervous cells during development in relation with their degree of 

 growth and functional maturity. (Methods: Piekarsky-Robinow; 

 Feulgen; Golgi; Cajal) (Mammalia) 



b. Study of the development of cytoarchitecture and genesis of the furrows 

 in some areas of the cerebral cortex. Homo and Felis (Mammalia) 



c. Morphological and histochemical studies of histogenesis of chondroid 

 and mucous tissues. (Aves and Mammalia) 



d. Histochemical study of histogenesis of cartilage. Mus rattus (Rodentia) 

 (in collaboration with G. RONCORONI) 



PRIESCHING, A. M.D. — Anat. Inst, der Univ. Wien. Wahringerstr. 13, 

 WIEN IX. Oesterreich. 

 a. Development of peritoneal folds and adhesions separating different parts 

 of the bursa omentalis. Homo sapiens (Primates) 

 PRINS, F. X. M.Sc — Zool. Inst., Univ. of Stellenbosch, STELLEN- 

 BOSCH, S. Africa. 

 a. Ontogenesis of the vertebral column. Spheniscus demetsus (Aves) 

 PROP, N. B.Sc. — Anat.-Embryol. Lab. der Rijks Univ., Ooster- 

 singcl 69, GRONINGEN, Holland, 

 a. Development of the egg by means of vital staining. Ambystoma 

 (Urodela) 

 QUERNER, H. Dr rer.nat. — Inst, fiir Entwicklungsphysiol. der Univ. 

 Koln, Amsterdamerstr. 36, KoLN-Riehl, Deutschland. 



