a Effects of antiserum made from total egg homogenate, whole embryo extract, and specific 



egg and embryo products on development. Acanthaster planci (Asteroidea) 

 b Effects of inhibitors of mitosis (e.g. colcemid) and DNA synthesis (e.g. 5-bromodeoxyuri- 



dine) on the appearance of crystallins in the lens placode (immunofluorescence and 



peroxidase-labeled antibodies). Gallus domesticus (Aves) 

 PEDERNERA, E. A. Dr.Med. — Dept. de Histol. y Embriol., Fac. de Cienc. Med., Univ. 



Nac. de Rosario, Santa Fe 3100, ROSARIO, Argentina 

 a Activity of enzymes related to pentose phosphate pathway and steroid biosynthesis 



correlated to the functional differentiation of the adrenal gland in the embryo. Gallus 



domesticus (Aves) 

 PEDERSEN, K. J. Ph.D. — Inst, of Gen. Zool., Univ. of Copenhagen, 15 Universitetsparken, 



DK 2100 COPENHAGEN 0, Denmark 

 a Formation of connective tissue filaments in regenerating animals. Dugesia tigcina (Turbel- 



laria) 

 b Cytology and cytochemistry of starving animals. Same species as b 

 c Cellular basis for regeneration. Lineus ruber (Nemertea) 

 PEGRUM (HALL), Mrs. S. M. B.Sc. — Dept. of Zool. and Comp. Anat., Univ. Coll. 



London, Gower St., LONDON WC1E 6BT, England 

 a Cell relations in tissue culture. Gallus gallus (Aves), Mus musculus (Rodentia) (with 



M. ABERCROMBIE and J. E. M. HEAYSMAN) 

 PEHLEMANN, F.-W. Dr. — Anat. Inst, der Univ., Neue Univ. Eingang F 1, 23 KIEL, 



W.Germany 

 a Ultrastructural morphogenesis of endocrine glands (adenohypophysis, adrenal, thyroid). 



(Amphibia, Mammalia) 

 b Ultrastructure of amitotic cell division. (Amphibia, Mammalia) 

 PELLING, C. Dr. — Max-Planck-Inst. fur Biol., Abt. Beermann, Spemannstr. 34, 74 



TUBINGEN, W.Germany • 



PENER, M. P. Ph.D. — Dept. of Entomol., The Hebrew Univ., JERUSALEM, Israel 

 a Effect of temperature and humidity on embryonic development and their role in embryonic 



diapause. Schistocerca gregaria, Oedipoda miniata and other spp. (Orthoptera) 

 b Hormonal effects on oocyte development and on egg-laying. Homorocoryphus nitidulus 



(Tettigoniidae) , various spp. (Accididae, Orthoptera) 

 PENMAN, S. — Dept. of Biol., Massachusetts Inst, of Technol., CAMBRIDGE, Mass. 02139, 



U.S.A. „ • 



PENTZ, S. Dr.phil. -« Heiligenberg Inst., 7799 HEILIGENBERG, Baden, W.Germany 

 a Rontgeninduktion von Mutationen an Flugelschuppen. Plodia interpunctella (Lepidoptera) 

 b Zyklus der Fliigelzellen nach der Diapause. Same species as a 



PERKOWSKA (MOSER), Mrs. E. Ph.D. — Zaulek 28, Zoliborz, WARSZAWA, Poland 

 PERLMANN, H. P. Ph.D. — Wenner-Gren Inst., Norrtullsgatan 16, S-113 45 STOCK- 

 HOLM, Sweden • 

 PERRIER, Mrs. H. D.E.S. — Lab. de Physiol. Anim., Fac. des Sci., B.P. 347, 51 REIMS, 



France 

 a Electron microscopy of the foetal and perinatal pancreas. Rattus nocvegicus (Rodentia) 

 PERRY, Miss M. M. B.Sc. — Inst, of Anim. Genet., Univ. of Edinburgh, West Mains Rd.. 



EDINBURGH EH9 3JN, Scotland, U.K. 

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



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

 b Electron microscopy of mutants. Drosophila spp. (Diptera) (with C. H. WADDING- 

 TON) 

 c Ultrastructural and experimental study of cleavage. Triturus alpestris (Urodela) , Xenopus 



laevis (Anuca) 

 PERSAUD, T. V. N. M.D., Ph.D. — Dept. of Anat., Fac. of Med., Univ. of Manitoba, 



750 Bannatyne Ave., WINNIPEG 3, Man.. Canada 

 a Embryopathy activity of the active principles contained in West Indian medicinal plants. 



Rattus norvegicus, Mus musculus (Rodentia), Oryctolagus cuniculus (Lagomorpha) 

 b Teratogenic activity of psychotropic substances (cannabis, LSD etc.). Rattus norvegicus 



(Rodentia), Oryctolagus cuniculus (Lagomorpha) 

 c Ontogenetic pattern of enzymes in normal and abnormal development (histochemistry, 



biochemistry) . Rattus norvegicus (Rodentia) 

 PERSOV, G. M. Dr.biol.sci. — Biol. Inst, Leningrad State Univ., LENINGRAD B-164, 



U.S.S.R. 

 a Sex differentiation. (Chondrostei; Teleostei) 



b The process of gametogenesis under ionizing radiations. Same species as a 

 PETERS, A. Ph.D., Prof. — Dept. of Anat., Boston Univ., 80 East Concord 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., 49 Strandboulevarden, 2100 COPEN- 

 HAGEN 0, Denmark 



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