PEDERSEN. K. J. M.Sc. — Inst, for Aim. Zool., Universitetsparken 3, CO- 

 PENHAGEN 0, Denmark 

 a. Biochemistry of regeneration processes. (Planaviidae, Plathclminthes) 

 PEHRSON. G. T. Dr. Phil.. Prof.(Emer.) — Zootom. Inst., Univ. of Stock- 

 holm. Radmansgatan 70A. STOCKHOLM, Sweden 

 a. Development and morphology of the skull and of the lateralis system. 

 (Teleostei) 

 PENZLIN, H. Dr. rer. nat. — Zool. Inst, der Univ. Rostock, Stalinplatz, 

 ROSTOCK, Deutsche Demokratische Republik 



a. Physiologie der Regeneration. Cordylophora caspia (Hydrozoa) 



b. Physiologie und Histologic der Regeneration. Blattella spec, Periplaneta 

 spec. (Orthoptera) 



PERA, L. M.D. — Inst, of Anat. and Histoembryol., Univ. of Pisa, Via 

 Roma 33, PISA, Italy 



a. Comparative studies on the sympathetic nervous system. (Reptilia; Aves) 



b. Comparative research on the cloaca. (Pisces; Reptilia; Aves) 



f PERCIVAL, E. B.Sc, Prof. — Dept. of Zool., Canterbury Univ. Coll., 



CHRISTCHURCH, New Zealand 



(deceased) 

 PERKOWSKA, Mrs. E. MOSER Dr. — Dept. of Cytol., Warsaw Univ., 



Krakowskie Przedmiescie 26/28, WARSZAWA 64, Poland 

 a. Some biochemical characteristics of embryonic mitochondria. Rattus spec. 



(Rodentia) 

 PERLMANN, H. P. Ph.D. — Wenner-Grens Inst, for exper. Biol., Norr- 



tullsgatan 16, STOCKHOLM Va., Sweden 



a. Immunological approach to the problems of fertilization and differen- 

 tiation. (Echinoidea) 



b. Serological study of proteins during early development. Paracenttotus 

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

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



PERRENOT, Miss M. Lie. es Sci. — Lab. de Zool. et d'Embryol. exper., 



Inst, de Zool. et de Biol, gener., 12 Rue de l'Universite, STRASBOURG, 



France 

 a. Differenciation du complexe surrenalien et eveil des correlations hypo- 



physo-surrenaliennes. Gallus spec. (Aves) 

 PERRI, T. Dott., M.I. I.E., Prof. — 1st. di Anat. Comp., Fac. di Sci., S. Pie- 



tro, PERUGIA, Italia 



a. Trapianti eteroplastici di arti. Bufo vulgaris, B. viridis (Anura) 



b. Correlazioni tra sistema nervoso ed arti. Bufo vulgaris, B. viridis (Anura) 



c. Azione biologica dei raggi X. Bufo vulgaris, B. viridis (Anura) 

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



King's Buildings, West Mains Road, EDINBURGH 9, Scotland 



a. Developmental effects of metabolic antagonists. (Evertebrata, Verte- 

 brata) (in collaboration with C. H. WADDINGTON) 



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

 WADDINGTON) 



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

 graphs. (Diptera), (Amphibia) (in collaboration with G. G. SELMAN 

 and C. H. WADDINGTON) 



PERTUSA, J. Lie. So, Dr.Ph. — Dept. of Embryol., Univ. Coll. London, 

 Gower St., LONDON W.C. 1, England 



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