b. Regenerative capacity and immunity in ontogenesis. Rana temporaria. 

 Bombina bombina (Anura) 



c. Regeneration of brain. Felis domestica, Canis [amiliaris, Rattus norve- 

 gicus (Mammalia) 



d. Regeneration of myocardium. Rattus norvegicus, Oryctolagus cuniculus, 

 Felis domestica (Mammalia) 



e. Regeneration of dental tissue. Canis [amiliaris (Carnivora) 



f. Restoration of regeneration capacity of limbs after X-irradiation. Am- 

 bystoma mexicanum (Urodela) 



POPOV, V. V. Dr., Prof. — Dept. of Embryol, Fac. of Biol., Moscow 

 Univ., MOSCOW 234, U.S.S.R. 



a. Developmental physiology of the sense organs, and the significance of 

 irritability for the evolution of morphogenesis. 



b. Significance of the morphogenetic properties of the layers of the retina 

 for the development of the dioptric system of the eye. 



POPP, R. A. Ph.D. — Biol. Div., Oak Ridge National Lab., P.O. Box Y, 



OAK RIDGE, Tenn., U.S.A. 

 PORTMANN, A. Dr.Phil., Prof. — Zool. Anstalt der Univ., Rheinsprunq 9 



BASEL, Schweiz 



a. Embryology and postembryonic development. ( Vettebrata) 



b. Embryology of the forebrain (including postembryonic stages). (Aves; 

 Mammalia) 



c. Embryology of blood formation. (Aves) 



d. Development of skin pattern. (Reptilia) 



e. Development. (Opisthobranchia, Gastropoda) 



f. General embryology. Octopus spec, Eledone spec. (Cephalopoda) 

 POULSON, D. F. B.S., Ph.D., M.I.I.E., Prof. — Dept. of Zool. (Osborn 



Zool. Lab.), Yale Univ., NEW HAVEN 11, Conn., U.S.A. 



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



b. Chromosomal control of differentiation. Drosophila melanogaster (Dipte- 

 ra) 



c. Neurogenesis in normal and genetically deficient embryos. Drosophila 

 melanogaster (Diptera) 



d. Maternally inherited sex-ratio disturbances of development. Drosophila 

 bifasciata, D. melanogaster, D. willistoni (Diptera) 



e. Developmental genetics. Drosophila nebulosa (Diptera) 

 POURREAU (SCHNEIDER), Mrs. N. M. B.A., Dr. de l'Univ. de Paris — 



Lab. d'Embryol. exper. du Coll. de France, 1 1 Place Marcelin Berthelot, 

 PARIS Ve, France 



— Lab. d'Embryol. et Teratol. exper. du C.N.R.S., 49bis Avenue de la 

 Belle Gabrielle, NOGENT sur Marne (Seine), France 



a. Culture in vitro of adult chick organs as a medium for the proli- 

 feration of cancers from another species. 



b. In vitro studies on hematopo'iesis in embryonic and adult spleens. 

 (Aves; Mammalia) 



POURTOIS, M. M.D., Lie. en Sci. dent. — Lab. d'Anat. et d'Embryol., Fac. 

 de Med. de l'Univ., 97 Rue aux Laines, BRUXELLES, Belgique 

 a. Cytochimie des ebauches dentaires. Mus musculus (Rodentia) 

 PRASAD, M. R. N. M.Sc, Ph.D. — Dept. of Zool., Univ. of Delhi, DELHI 

 6, India 

 a. Reproductive cycles. Tatera indica cuvierii (Cricetinae, Rodentia) 



111 



