b Influence of external factors (temperature, humidity) on egg development. Acrotylus 

 insubricus, Aiolopus thalassinus, Morphacris fasciata sulcata, Oedipoda miniata. O. aurea, 

 O. coerulescens, Locusta migratoria migratorioides. Nomadacris septemfasciata (Acrididae, 

 Orthopfera (in collaboration with Mrs. S. A. BLONDHEIM and A. SHULOV) 



c Proteolytic enzymes in relation to embryonic stages. Locusta migratoria migratorioides 

 (Acrididae, Orthoptera) (in collaboration with A. SHULOV) 



PENTZ, S. Dr.phil. — Heiligenberg-Institut, 7799 HEILIGENBERG/Baden, Deutsche Bun- 

 desrepublik 



a Rontgeninduktion von Mutationen an Fliigelschuppen. Plodia interpunctella (Lepidopfera) 



h Induktionsbedingungen der larvalen Diapause. Plodia interpunctella (Lepidoptera) 



PENZLIN, H. Dr.rer.nat. — Zool. Inst, der Univ., Universitatsplatz 2, ROSTOCK, Deutsche 

 Demokratische Republik 



a Physiologie der Regeneration. Cordylophora caspia (Hydrozoa) 



b Physiologie und Histologie der Regeneration. Blattella spec, Periplaneta spec. (Orthop- 

 tera) 



PERA, L. M.D. — Inst, of Anat. and Histoembryol., Univ. of Pisa, Via Roma 55. PISA, 

 Italia 



PERKOWSKA (MOSER). Mrs. E. Ph.D. — Inst, of Anim. Genet., King's Buildings, West 

 Mains pa.. EDINBURGH 9, Scotland, U.K. 



a Types of RNA synthesis in early embryonic tissues. (Amphibia) (in collaboration with 

 C. H. WADDINGTON) 



PERLES, B. — Lab. d'Anat., Fac. de Med., 45 Rue des Sts.Peres, PARIS Vie, France 



a Developpement de I'oreille interne. Homo sapiens (Primates) 



• PERLMANN, H. P. Ph.D. — Wenner-Gren's Inst, for exper. Biol., Norrtullsgatan 16, 

 STOCKHOLM Va., Sweden 



PERRY, Miss M. M. B.Sc. — Inst, of Anim. Genet., King's Buildings, "West Mains Rd., 

 EDINBURGH 9, Scotland, U.K. 



a Study of certain features of developing embrvos by electron microscopy. (Amphibia) (in 

 collaboration with J. JACOB and C. H. WADDINGTON) 



b Electron microscope studies of mutants. Drosophila spp. (Dipfera) (in collaboration with 

 C. H. WADDINGTON) 



c Ultrastructural changes during grovi^th. Micrasterias thomasiana (Desmidoidea, Conju- 

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



PERSOV, G. M. Cand.biol.sci. — Biol. Inst., Leningrad State Univ., LENINGRAD V.164, 

 U.S.S.R. 



a Sex differentiation. (Chondrostei; Teleostei) 



h The process of gametogenesis under ionizing radiations. (Chondrostei; Teleostei) 



PERTUSA. J. Ph.D. — Inst. Biol, de Sarria. Dr.Amigant 31, BARCELONA 17, Spain 



a Studies on morphogenetic movements in the blastoderm. Callus domesticus (Aves) 



PETERS, A. Ph.D., Prof. — Dept. of Anat., School of Med., Boston Univ., 15 Stoughton 

 St., BOSTON, Mass. 02118, U.S.A. 



a Electron microscopic study of the formation of myelin sheaths and development of 

 neuroglial cells in the central nervous system. Rattus domesticus (Rodentia) 



PETERS, Mrs. H. M.D. — Finsen Lab., Finsen Inst., Strandboulevarden 49. COPEN- 

 HAGEN, Denmark 



PETERS, J. J. Ph.D., Prof. — Dept. of Biol., Xavier Univ., Victoria Parkway. CINCIN- 

 NATI. Ohio 45207. U.S.A. 



a Developmental changes in the spontaneous electrical activity of the cerebral lobes before 

 and after hatching during various behavioral states, and when subjected to hypothermia, 

 hypoxia, photic stimulation, and some drugs. Callus domesticus (Aves) 



PETERS, N. W. Dr.rer.nat. — Inst, fur Hydrobiol. und Fischereiwiss., Univ. Hamburg, 

 Olbersweg 24, 2 HAMBURG- Altona 1, Deutsche Bundesrepublik 



a Diapause and developmental pathology (effect of environmental factors on embryonic 

 development). Nothobranchius guentheri, Riuulus cytindraceus (Cyprinodonfidae, Tele- 

 ostei) 



PETERS, Th. Dr.med. — Anat. Inst, der Univ. Giessen, Friedrichstr. 24. GIESSEN. Deut- 

 sche Bundesrepublik 



PETIT, A. Lic.es Sci. — Lab. de Zool. et d'Embryol. exper., Fac. des Sci.. Univ. de Stras- 

 bourg, 12 rue de lUniversite. STRASBOURG, France 



PETRUCCI. D. — Dept. of Gener. Biol., Univ. of Sassari. SASSARI, Italia 



PETRY, G. Dr.med., Prof. — Anat. Inst, der Univ., Robert Kochstr. 6, MARBURG/Lahn. 

 Deutsche Bundesrepublik 



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



b Entwicklung von Epithelien. 



PEXIEDER, T. M.D. — Inst, of Embryol., Fac. of Med., Charles Univ., Albertov 4. 

 PRAGUE 2. Czechoslovakia 



a Normal development of the aortic arches. Callus domesticus (Aves) 



h Experimental morphology of the aortic arches and branchial arches. Callus domesticus 

 (Aves) 



118 



