POLEZHAEV. L. V. Dr.biol.sci.. Prof. — Inst, of Developm. Biol.. Acad, of Sci. of the 



U.S.S.R.. Vavilov St. 26, MOSCOW B-133, U.S.S.R. • 



a Regeneration of cranium bones. Mus domesticus, Rattus norvegicus, Oryctolagus cuniculus, 



Felis domestica, Canis familiaris (Mammalia) 

 b Regeneration of dental tissue. Canis familiaris (Carnivora) 

 c Regeneration of myocardium. Rattus norvegicus, Oryctolagus cuniculus, Felis domestica, 



Canis familiaris (Mammalia) 

 d Restoration of regeneration capacity of limbs after X-irradiation. Ambystoma mexicanum 



(Urodela) (in collaboration with Miss N. A. TEPLITZ and Mrs. S. J. TUCHKOVA) 

 e Physiological regeneration of the brain. Felis domestica, Rattus norvegicus (Mammalia) 

 POLGE, C. Ph.D. — A.R.C. Unit of Reprod. Physiol. & Biochem., Univ. of Cambridge, 307 



Huntingdon Rd., CAMBRIDGE, England 

 a Factors influencing fertilization and early embryonic development (effects of age of 



gametes, administration of drugs and hormones, in vitro treatments and transplant- 

 ations). Sus scrofa (Actiodactyla) 

 POLLARD, D. R. Ph.D. — Dept. of Genet., Albert Einstein Coll. of Med., Yeshiva Univ., 



Eastchester Rd. & Morris Park Ave., NEW YORK, Bronx, N.Y. 10461, U.S.A. 

 a A study of the morphogenetic movement involved in closure of the secondary palate with 



special reference to strain differences in response to the cleft palate-producing effect of 



6-aminonicotinaraide. Mus musculus (Rodentia) 

 h The role of cytoplasmic genes in development. Mus musculus (Rodentia) 

 POLTEVA, Mrs. D. G. — Dept. of Embryol. Leningrad Univ., Mendeleevsky St. 5, 



LENINGRAD B-164, U.S.S.R. 

 a Somatic embryogenesis and regeneration. Metridium senile fimbriatum, Anthopleura spec. 



(Zoantharia, Actinozoa) 

 b Action of neuropharmaca on somatic embryogenesis. Metridium senile dianthus (Zoan- 



tharia, Actinozoa) 

 c Dedifferentiation of cells during morphogenetical processes in regeneration and somatic 



embryogenesis. Metridium senile dianthus (Zoanthara, Actinozoa) 

 PONTIER. J. Dr.es Sci. — Sect, de Biol. Gen. et Appl., Univ. de Lyon, 43 Bd. du 11 



Novembre 1918, 69 VILLEURBANNE, France 

 a Analyse factorielle appliquee a I'etude de la morphogenese. Myzus persicae (Aphididae, 



Rhynchota) 

 POPOV, V. V. Dr.biol.sci., Prof. — Chair of Embryol., Biol. Fac, State Univ. of Moscow. 



Lenin Hills, MOSCOW V-234, U.S.S.R. 

 POPP, R. A. Ph.D. — Biol. Div.. Oak Ridge Natl. Lab.. P.O. Box Y. OAK RIDGE, Tenn. 



37830, U.S.A. 

 a Ontogeny of variant forms of esterases in tissues; qualitative and quantitative chacteristics 



of allelic forms of esterases studied by starch and/or acrylamide gel electrophoresis. 



Mus musculus (Rodentia) 

 b Compensatory effect of multiple esterases owing to the action of null genes. Mus musculus 



(Rodentia) 

 PORCELLI. Miss F. Dr. — Inst, of Histol. and Embryol., Univ. of Pavia, Piazza Botta 10, 



27100 PAVIA, Italy 

 a Histology, histochemistry and enzymology of yolk sac (pre- and postembryonic stages). 



Salmo irideus (Salmonidae, Teleostei) 

 PORTER, K. R. Ph.D., Prof. — Biol. Labs., Harvard Univ., 16 Divinity Ave., CAM- 

 BRIDGE, Mass. 02138, U.S.A. • 

 PORTMANN, A. Dr.Phil., Prof. (Emer.) — Zool. Anstalt der Univ., Rheinsprung 9, 4000 



BASEL. Switzerland 

 a Embryology. (Opisthobranchia, Prosobranchia, Gastropoda; Aves; Mammalia) 

 h Morphological analysis of early postembryonic development. (Rodentia; Insectivora) 

 PORTMANN, Miss A.-M. Lic.es Sci. — Lab. de Zool., Fac. des Sci. de Nancy, 30 rue Ste 



Catherine, 54 NANCY, France 

 POTEMKINA, Mrs. D. A. Cand.biol.sci. — Chair of Embryol., Biol. Fac, State Univ. of 



Moscow, Lenin Hills, MOSCOW V-234, U.S.S.R. 

 POULSON, D. F. Ph.D., Prof. — Dept. of Biol., Kline Biol. Tower, Yale Univ., NEW 



HAVEN, Conn. 06520. U.S.A. • 



a Mid-gut: genesis and differentiation. Drosophila melanogasfer (Diptera) 

 h Chromosomal control of differentiation. Drosophila melanogasfer (Diptera) 

 c Neurogenesis in normal and genetically deficient embryos. Drosophila melanogaster (Dip- 



tera) 

 d Maternally inherited sex-ratio disturbances of development. Drosophila melanogaster, D. 



bifasciata. D. willistoni, D. nebulosa, D. equinoxialis, D. robusta (Diptera) 

 e Developmental genetics. Drosophila melanogaster (Diptera) 

 POURHADI. R. M.D. — Lab. d'Histol.-Embryol., Fac. de Med., Bd. Winston Churchill, 



B.P. 38, 63 CLERMONT-FERRAND, France 

 a Action of ultrasound on embryonic organisms. Triturus helveticus (Urodela) 



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