PEPPER, Miss F. J. B.Sc. Ph.D. — Dept of Zool. and Comp. Physiol., 

 Birmingham Univ.. Edgbaston, BIRMINGHAM 15, England 

 (no embryological work in progress) 



PERCIVAL, E. B.Sc. — Dept of Zool. Canterbury Univ. Coll.. CHRIST- 

 CHURCH, New Zealand 

 a. Embryology. Tegulorhynchia nigricans (Brachiopoda) 



PERLMANN, H. P. — Wenner-Grens Inst, for exper. Biol.. Norrtullsqatan 

 16, STOCKHOLM Va., Sweden 

 a. Serological study of proteins during early development. Paracentrotus 

 lividus (Echinodermata) (in collaboration with Mrs J. C. KALTEN^ 

 BACH, Evanston. 111.. U.S.A.) 



PERRI, T. Dott., M.I.I.E.. Prof. — 1st. di Anat. Comp. dell'Univ.. Fac. di 

 Sci., Via BorelH 50. ROMA. Itaha 



PERRY, Miss M. M. — Inst, of Animal Genet.. Univ. Dept of Genet., 

 King's Buildings, West Mains Rd, EDINBURGH 9. Scotland 



a. Electron microscope studies of gene action (in collaboration with C. H. 

 WADDINGTON and E. OKADA) 



b. Study of certain features of developing embryos using electronmicro- 

 graphs of ultrathin sections and cytochemical techniques. Drosophila 

 melanogaster (Diptera), (Amphibia) (in collaboration with C. H. 

 WADDINGTON and G. G. SELMAN) 



c. Developmental effects of metabolic antagonists. (Evertebrata, Vevte- 

 brata) (in collaboration with C. H. WADDINGTON and F. BIL- 

 LETT) 



PERSSON, H. Fil.mag. — Zoophysiol. Inst.. Univ. of Lund. LUND. 



Sweden 

 PESONEN, S. K. Ph.D. — Zool. Lab.. Univ. of Helsinki, P. Rautatie- 



katu 13. HELSINKI. Finland 



(no embryological work in progress) 

 PETERS. Th. Dr med. — Heiligenberg-Inst., (17b) HEILIGENBERG. 



Kreis Ueberlingen/Bodensee. Deutschland 

 a. Einfluss der Rontgenstrahlen auf die Entwicklung. (Urodela) 

 RETRY. G. Dr med.. Prof. — Anat. Inst, der Univ.. Robert Kochstr. 6, 



MARBURG, Lahn. Deutschland 

 a. Funktionelle Histologie der Eihaute. (Mammalia) 

 PFLUGFELDER, O. Dr rer.nat.. Prof. — Zool. Inst, der Landwirtschaftl. 



Hochschule, STUTTGART-HOHENHEIM. Deutschland 



a. Anderung des Stoffwechsels nach Storung des hormonalen Gleichge- 

 wichts. (Insecta) 



b. Entwicklungsphysiologie von Schwanzmissbildungen. (Teleostei, Aves) 



c. Einfluss der Pinealektomie auf die Postembryonalentwicklung. Lebistes 

 reticulatus (Teleostei), (Amphibia, Sauropsida) 



d. Entwicklung. (Acari, Arachnoidea) 



e. Histophysiologie der Corpora cardiaca. (Insecta) 



PIATT, J. A.B.. M.A.. Ph.D. — Dept of Anat.. School of Med.. Univ. of 



Pennsylvania. PHILADELPHIA -i. Pa. U.S.A. 

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



Naturw. Fak.. Bahnhofstr. 28. GOTTINGEN. Deutschland 

 PINCUS. G. Dr, Prof. — Worcester Foundation for Exper. Biol., 222 



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



85 



