a Nuclear-cytoplasmic interactions studied by RNA migration, histone turnover and 



localization of nonhistone protein turnover exchange. Amoeba proteus (Amoebina) 

 b Subunit organization of chromosomes revealed by nonrandom exchange (exchange spots) 



of sister chromatids. Microcricetus auratus (Rodentia) 

 c Initiation and localization of DNA synthesis in relation to amino acids, nucleosides and 



nucleokinases. Tetrahymena pyriformis. Euplotes eurystomafus (Ciliata) 

 PRESLEY, R. M.B., B.Chir. — Anat. School, Univ. of Cambridge, CAMBRIDGE, England 

 a Tissue culture and organogenesis. (Mammalia) 

 h Ultrastructure of embryos. Various spp. (Rodentia) 



PRESTIGE, M. C. M.A. — Dept. of Zool., Univ. of Bristol. BRISTOL 8. England 

 PRESS, N. Ph.D., Prof. — Dept. of Zool.. Univ. of Wisconsin, MILWAUKEE, Wis. 53201. 



U.S.A. 

 a Transfer of macromolecules from follicle cells to developing oocytes. (Aves) 

 b Unusual organelles in the ovary. (Aves) 

 c Respiration of oocytes. (Aves) 

 • PRICE, Miss D. Prof. — Dept. of Zool., Biol. Sci. Div., Univ. of Chicago, 1101 East 57th 



St., CHICAGO, 111. 60637, U.S.A. 



— temporarily: Lab. for Cell Biol, and HistoL, Fac. of Med., State Univ., Rijnsburgerweg 

 10, LEIDEN, Netherlands 



PRITCHARD, E. T. Ph.D., Prof. — Dept. of Oral Biol., Univ. of Manitoba, WINNIPEG. 



Manitoba, Canada 

 a Disposition of linoleic-1-C^"* acid in brain in vivo during early growth and devel- 

 opment. Rattus norvegicus (Rodentia) 

 h Cholesterol esterase activity in developing brain. Rattus norvegicus (Rodentia) 

 c Lipid content of developing salivary gland and possible role in secretion. Rattus norvegicus 



(Rodentia) 

 PROPPER, A. Doct.3e Cycle — Lab. de Zool.. Inst, des Sci. Nat., Fac. des Sci., Univ. de 



Besan?on, Place Marechal Leclerc, 25-BESANgON, France 

 a Organogenese de la glande mammaire par la methode des cultures d'organe et des greffes 



embryonnaires. Mus musculus (Rodentia), Oryctolagus cuniculus (Lagomorpha) (en 



collaboration avec L. GOMOT) 

 PROVENZANO, A. J. Ph.D.. Prof. — Inst, of Marine Sci.. Univ. of Miami, 1 Ricken- 



backer Causeway, Virginia Key, MIAMI, Fla. 33149, U.S.A. 

 a External morphology of larval stages with consideration for the development of taxonomic 



characters. Many spp. (Decapoda, part. Diogenidae, Crustacea) 

 h Effects of some environmental factors on larval development. (Anomura, Decapoda. 



Crustacea) 

 PRUDHOMME, J. C. Lie. es Sci. — Section de Biol, generale et appliquee. Fac. des Sci.. 



Univ. de Lyon, 43, Bd. du 11 Novcmbre 1918, 69-VILLEURBANNE, France 

 a Culture d'organes in vitro. Bombyx mori (Lepidoptera) 

 PUCCIA, E. D.Sc. — 1st. di Zool., Via Archirafi 18, PALERMO, Italia 



— temporarily: Biol. Div.. Oak Ridge Natl. Lab., P.O.Box Y, OAK RIDGE, Tenn. 37831. 

 U.S.A. 



a Study of RNA synthesis in lens regenerates with sucrose density gradient. (Urodela) (in 



collaboration with D. H. REESE and T. YAMADA) 

 PUCCINELLI, Mrs. I. Dr.Nat.Sci. — 1st. di Zool. e Anat. comp. dell'Univ., Via A. Volta 4, 



PISA, Italia 

 a Development and cytology. (Tricladidea, Turbellaria; Hirudinea. Annelida) 

 PURKO, J. Ph.D. — Dept. of Zool.. Coll. of Sci., Univ. of Western Ontario, LONDON, 



Ont., Canada 

 a Biological action of alkylating agents (sulphur and nitrogen mustards) and mechanism of 



resistance to their effects in embryos and in fibroblasts grown in culture. (Teleostei), 



Mus musculus (Rodentia) 

 h Mechanisms underlying processes in early embryogenesis and cell division, using various 



metabolic inhibitors of DNA. RNA and proteins, and correlating their biological and 



biochemical effects. (Teleostei) 

 c Biological action of the "chemosterilant" hempa (hexamethylphosphoric triamide) and 



mechanism of resistance to its effects in embryos and in fibroblasts grown in culture. 



(Teleostei), Mus musculus (Rodentia) 

 PUZA. V. — Dept. of Biol., Med. Fac. Charles Univ., Simkova 870, HRADEC KRALOVfi. 



Czechoslovakia 

 a Muscle cell development in tissue culture (mitosis, origin and cau.ses of multinuclearity). 



Gallus domesticus (Aves), Rattus norvegicus, Mus muculus (Rodentia) 

 PUZANOVA. Mrs. L. MUDR., C.Sc. — Dept. of Anat., Charles Univ., U nemocnice 3. 



PRAHA 2. Czechoslovakia 

 a Development of the internal structure of muscles. Rattus albus (Rodentia), Homo sapiens 



(Primates) 

 PYLILO, Miss I. v. — Dept. of Embryol.. Leningrad Univ.. Mendeleevsky St. 5. LENIN- 

 GRAD B-164. U.S.S.R. 

 a Regeneration. Beroe cucumis (Ctenophora) 



122 



