b The influence of conditional stimulation of the retina on Wolffian lens regeneration. 



Triturus taeniatus (Urodela) 

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



37830, U.S.A. 

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



27100 PAVIA, Italy 

 a The differentiation of skin. Salmo irideus, S. fario (Teleostei) 

 b The differentiation of the mucous cells of the gills. Same species as a 

 PORRAS de CARRERO, Mrs. I. Lie. Bio. — Cat. de Embriol., Fac. de Med., Univ. de Los 



Andes, MERIDA, Venezuela 

 a Development of the vascular system in limb muscles (injected specimens). Homo sapiens 



(Primates) 

 PORTER K R. Ph.D., Prof. — Dept. of Molec, Cell., and Developm. Biol., Univ. of 



Colorado, BOULDER, Colo. 80302, U.S.A. • 



PORTMANN, A. Dr.Phil., Prof.(Emer.) — Zool. Anstalt der Univ., Rheinsprung 9, 4051 



BASEL, Switzerland 

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



b Morphological comparative analysis of early postembryonic development. (Aves; Mam- 

 malia) 

 POSINOVEC, Mrs. J. M.D., D.Sc, Prof. — Inst, of Histol. and Embryol., Univ. of Zagreb, 



Salata 3, P.O.Box 166, 41001 ZAGREB, Yugoslavia 

 a Anomalies of spermatogenesis due to disorders in testis development. Homo sapiens 



(Primates) 

 b Appearance and pattern formation of reticulin fibers during ontogenesis of the testis. 



Same species as a 

 c Embryonic development of the parotid gland. Same species as a 

 POSTLETHWAIT, J. H. Ph.D. — Dept. of Biol., Univ. of Oregon, EUGENE, Ore. 97403, 



U.S.A. 

 a The clonal nature of determination in homoeotic mutants. Drosophila melanogaster 



(Diptera) 

 b The mechanism of action of homoeotic mutants. Same species as a 

 c The heritability of sex determination in triploid intersexes. Same species as a 

 d The role of the cortex in early development. Same species as a 

 e The hormonal control of metamorphosis. Same species as a 

 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 melanogaster (Diptera) 

 b Chromosomal control of differentiation. Drosophila melanogaster (Diptera) 

 c Neurogenesis in normal and genetically deficient embryos. Drosophila melanogaster 



(Diptera) 

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



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

 e Developmental genetics. Drosophila melanogaster (Diptera) 

 POURANY, Miss R. M.Sc. — Dept. of Anat., Jawaharlal Inst, of Postgrad. Med. Educ 



and Research, PONDICHERRY-6, India 

 a Histogenesis of islets of Langerhans. Homo sapiens (Primates) 

 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 embryos. Triturus helveticus (Urodela) 



b Cytology of neonatal liver; differentiation of intercellular junctions, characters of micro- 

 bodies; histochemical differentiation. Mus musculus (Rodentia) (with J. P. TURCHINI 



and P. MALET) 

 POURREAU (SCHNEIDER), Mrs. N. M. Dr.es Sci. — Lab. d'Embryol. Exper. du Coll. de 



France et du C.N.R.S., 1 1 Place M.Berthelot, 75 PARIS Ve, France • 



a Use of organ culture and suspension culture techniques for the study of functional testicular 



interstitial cell tumors. Mus musculus, Rattus norvegicus (Rodentia) 

 b Establishment of cell lines from a rat testicular interstitial cell tumor for studies on the 



functional capacities of isolated Leydig tumor cells. Rattus norvegicus (Rodentia) 

 c Hormonal effects of a rat testicular interstitial cell tumor on the developing genital tract 



in organ co-culture. Same species as b 

 d Physiological effects of a Leydig cell tumor on the female. Same species as b 

 POURTOIS, M. M.D., Lic.Sc.Dent. — Lab. d'Embryol., Inst. d'Anat., Univ. libre de 



Bruxelles, 97 rue aux Laines, 1000 BRUXELLES, Belgium 

 a Normal and abnormal closure and fusion of primary and secondary palate (tissue culture, 



histochemistry, histology). Rattus norvegicus, Mus musculus (Rodentia), Homo sapiens 



(Primates) 

 b Morphogenesis and cytogenesis of tooth buds. Rattus norvegicus, Mus musculus (Roden- 

 tia) 

 PRAHLAD, K. V. Ph.D., Prof. — Dept. of Biol. Sci., Northern Illinois Univ., DeKALB, 111. 



60115, U.S.A. 



144 



