a. Enzymes and embryonic development. (Amphibia) (in collaboration 

 with P. PASQUINI) 



b. Growth and differentiation in regeneration. Hydra spec. (Hydroidea), 

 Planaria spec. (Turbellaria) (in collaboration with P. PASQUINI) 



c. Endogeneous respiration of oocytes. (Amphibia) 



PETRY, G. Dr.med., Prof. — Anat. Inst, der Univ., Robert Kochstr. 6, MAR- 

 BURG/Lahn, Deutsche Bundesrepublik 



a. Funktionelle Histologie der Eihaute. (Reptilia; Aves; Mammalia) 



b. Entwicklung von Epithelien. 



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

 Hochschule, STUTTGART-Hohenheim, Deutsche Bundesrepublik 



a. Anderung desStoffwechsels nachStorung des hormonalenGleichgewichts. 

 (Insecta) 



b. Einfluss der Pinealektomie auf die Postembryonalentwicklung. (Tele- 

 ostei) 



c. Histophysiologie der Corpora allata nach experimenteller Beeinflussung. 

 (Insecta) 



d. Wirkungsmechanismen von Thyreostatika. Rana temporaria, Xenopus 

 laevis (Anura) , Gallus domesticus (Aves) 



PHILPOTT, G. W. B.S., M.D. — Lab. of Neuroanat. Sci., N.I.N.D.B., Nat- 

 ional Inst, of Health, BETHESDA 14, Md., U.S.A. 

 a. Trophic interactions between embryonic nervous system and periphery. 

 Ga//us domesticus (Aves) (in collaboration with A. J. COULOMBRE) 



PIATIGORSKY, J. P. B.A. — Dept. of Embryol., Div. of Biol., California 

 Inst, of Technol., PASADENA 4, Calif., U.S.A. 

 a. Protein synthesis in marine embryos. ( Echinodermata) 



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

 Univ. of Pennsylvania, PHILADELPHIA 4, Pa., U.S.A. 



PIERRO, L. J. B.S., M.S., Ph.D., Prof. — Dept. of Anim. Genet, Storrs Agric. 

 Exp. Station, Univ. of Connecticut, STORRS, Conn., U.S.A. 



a. Teratogenic action of actinomycin D on developing embryos. Gallus do- 

 mesticus (Aves) 



b. Gene interaction in the control of formation of specific melanin granules. 

 Mus musculus (Rodentia) 



c. Eye development. Mus musculus (Rodentia) 



PIETRZYK (WALKNOWSKA), Mrs. J. M.Sc. — Dept. of Exper. Zool., 

 Polish Acad, of Sci., ul. Kopernika 7, KRAKOW, Poland 



a. Congenital malformations in relation to karyology. Mesocricetus auratus 

 (Mammalia) 



b. Chromosomes during embryonic development. Mesocricetus auratus (Ro- 

 dentia) 



PIK6, L. Ing.Agr., D.V.M. — Dept. of Embryol., Div. of Biol., California 

 Inst, of Technol., PASADENA 4, Calif., U.S.A. 



a. Physiology and cytology of fertilization (by phase- and electron-micro- 

 scopy). (Rodentia) 



b. Immunochemical study of spermatozoa and sperm-egg interacting sub- 

 stances. (Rodentia) 



c. Radiation biology of gametes. (Echinodermata; Rodentia) 



PILLERI, G. Dr.med. — Hirnanat. Inst, der Psychiatr. Univ. Klinik, Med. 

 Fak.. Bolligenstr. 117, Waldau, BERN, Schweiz 

 a. Entwicklung des Gehirns. Castor canadensis (Rodentia) 



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