Pletzen 72 Rap 



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



of Xenopus laevis. (Anura, Amphibia) (Normal Table) 

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



9, BASEL, Schweiz. 



(no data received over this year) 

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



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



a. Comparative studies on pole cells and mid gut differentiation in the 

 genus Drosophila (Diptera). 



b. Experimental studies on localization in the early embryo of Drosophila. 



c. Investigations on chromosomal control of early development in Drosophila 

 melanogaster by use of lethal chromosomal deficiencies. (Diptera) 



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

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



a. Histogenesis and angiogenesis in the suprarenal gland of the cat. Felis 

 catus (Mammalia) 



b. 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: Piekarski-Robinow; Feulgen; 

 Golgi; Cajal) (Mammalia) 



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

 in some areas of the cerebral cortex in Man. (Mammalia) 



RADECKA, E. M.Ph. — Inst. Zool., Uniw. we Wroclawiu, Zaktad Zool. 

 Ogolnej, ul. Sienkiewicza 21, WROCLAW, Polska (Poland), 

 a. Mitochondria during the development. Parascaris equorum (Nematoda) 

 RADKOWA, M. Vet. Phys. — Zaklad Histol. i Embryol., Uniw. Wro- 

 clawskiego, ul. Chalubinskiego 6a, WROCLAW, Polska (Poland), 

 a. Early developmental stages in mammals, (in collaboration with Z. 

 SEMBRATOWA) 

 RAMSEY, Mrs E. M. A.B., M.D., Res. Assoc. — Dept of Embryol., 

 Carnegie Inst, of Washington, Wolfe and Madison Strs, BALTIMORE 

 5, Md, U.S.A. 

 a. Placentation — Study of vascular pattern of endometrium throughout 

 pregnancy. Macaca mulatta (Rhesus monkey) (Mammalia) 

 RANDALL, J. T. Prof., F.R.S. — M.R.C. Biophysics Res. Unit, King's 

 Coll., Strand, LONDON W.C. 2, England. 



a. Spermatogenesis of Vivipara vivipara, studied by classical techniques and 

 by phase-contrast, polarised light, ultra-violet and electron microscopy. 

 (Gastropoda) (in collaboration with E. }. HANSON and S. T. 

 BAYLEY) 



b. Cytogenesis of vertebrate striped muscle, studied in the electron micro- 

 scope, and with the aid of tissue culture techniques, (in collaboration 

 with E. J. HANSON and S. T. BAYLEY) 



RANZI, S. Dr, Prof. — 1st. di Zool. e Anat. comp., Univ. di Milano, Via 

 Celoria 10, MILANO, Italia, 

 a. Proteins in embryonic development. (Amphibia) and (Echinodermata) 

 RAPPAPORT Jr, R. B.S., M.S. — Osborn Zool. Lab., Yale Univ., NEW 

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

 a. Regional density changes in the developing embryo in relation to growth 

 and differentiation. Rana pipiens and Amblystoma punctatum (Am- 

 phibia) (under direction of J. S. NICHOLAS and E. J. BOELL) 



