WILLIAMS. Miss G. H. Ph.D. — Dept. of Zool.. Univ. of Toronto, TORONTO 5, Ont.. 

 Canada 



WILLIAMS, Mrs. M. LYMAN M.D. — Dept. of Pediat., School of Med., Univ. of Penn- 

 sylvania, PHILADELPHIA, Pa. 19104. U.S.A. 



WILLIAMS N. E. Ph.D.. Prof. — Dept. of Zool.. Univ. of Iowa, IOWA CITY. Iowa 

 52240. U.S.A. 



a Electron microscopy of developing oral apparatus. Tetrahymena spec. (Ciliata) 



WILLIER. B. H. Ph.D.. Sc.D.. Prof. (Emer.) — Dept. of Biol.. Johns Hopkins Univ.. 

 Charles and 34th Sts., BALTIMORE, Md. 21218, U.S.A. • 



a Adaptive morphogenesis in the yolk-sac membrane. Gallus domesticus (Aves) 



WILLISON-BARFORD, Mrs. J. B.Sc. — Plant Physiol. Div., Dept. of Scient. and In- 

 dustrial Research, PALMERSTON NORTH, New Zealand 



WILSON, E. B.Sc. — Sect, of Exper. Neurol., Inst, of Neurol., Hosp. de Clinicas, MON 

 TEVIDEO, Uruguay 



a Regulation of cochlear input in the developing animal. Rattus norvegicus (Rodentia) 



WILSON, I. B. Ph.D. — Dept. of Zool., Univ. of North Wales. BANGOR. Caer- 

 narvonshire, Wales, U.K. 



a Investigations on the establishment of implantation and early pregnancy. Mus musculus 

 (Rodentia) 



b Experimental developmental morphology. Mus musculus (Rodentia) 



WILSON, J. G. Ph.D., Prof. — The Children's Hosp. Research Found., Elland and Bethesda 

 Aves., CINCINNATI, Ohio 45229. U.S.A. 



WILT, F. H. Ph.D., Prof. — Dept. of Zool., Univ. of California. BERKELEY, Calif. 94720. 

 U.S.A. • 



a Mechanism of origin of hemoglobin-synthesizing machinery during development. Gallus 

 domesticus (Aves) 



h Activation of protein and RNA synthesis in cleaving eggs. Strong ylocentrotus pucpuratus 



c RNA synthesis during development. Strongylocentrotus purpuratus (Echinoidea) (in col- 

 laboration with J. J. WARTIOVAARA, Helsinki) 



WIMSATT. W. A. Ph.D., Prof. — Div.of Biol. Sci., Cornell Univ., ITHACA, N.Y. 14850, 

 U.S.A. • 



WINGSTRAND, K. G. Dr.phil.. Prof. — Inst, of Comp. Anat., Universitetsparken 15. 

 COPENHAGEN 0, Denmark 



a Embryology. Armillifer spec. (Linguatulida) (in collaboration with A. N^RREVANG) 



WINNICKI, A. D.Sc. — Fac. of Marine Fish., ul. Kazimierza Krolewicza 3, SZCZECIN, 

 Poland 



WIREN, A. J. B.Sc. — Dept. of Zool., Univ. of British Columbia, VANCOUVER 8, B.C., 

 Canada 



a The effects of L-tyrosine and L-phenylalanine on the in vitro differentiation of the 

 early (24-32 hr.) neural crest: the frequency of pigment cell differentiation in various 

 concentrations of the two amino acids and an electron microscopic examination of the 

 cultured cells. Gallus domesticus (Aves) (in collaboration with C. V. FINNEGAN) 



WIRSfiN, C. M.D. — Dept. of Histol., Karolinska Inst.. Solnavagen 1. STOCKHOLM 60. 

 Sweden 



WISCHNITZER. S. Ph.D.. Prof. — Dept. of Biol.. Yeshiva Univ., 186th St. and Amster- 

 dam Ave., NEW YORK, N.Y. 10033, U.S.A. 



a Electron microscopic study of oogenesis. Triturus vicidescens (Urodela), Mus albicans 

 (Rodentia), Saimici sciureus. Homo sapiens (Primates) 



WITHERS, R. F. J. M.Sc. — Dept. of Biol, as Appl. to Med., The Middlesex Hosp. Med. 

 School, Cleveland St., LONDON. W.l. England 



a Genetical and developmental study of a trypan blue induced heart malformation. Rattus 

 norvegicus (Rodentia) 



WITSCHI, E. Ph.D.. M.D., Prof. — Biomed. Div., The Population Council, Rockefeller 

 Univ., NEW YORK, N.Y. 10021. U.S.A. • 



a Experimental studies on sex development. Xenopus laevis (Anura) 



h Oogenesis in relation to special hormonal conditions. Rattus norvegicus (Rodentia), Homo 

 sapiens (Primates) 



c Maturation cycles of eggs in constant-estrus females. Rattus norvegicus (Rodentia) 



WITTENBORG. M. H. M.D., Prof. — Children's Hosp. Med. Center, 300 Longwood Ave., 

 BOSTON, Mass. 02115, U.S.A. 

 — Harvard Med. School, 25 Shattuck St.. BOSTON, Mass. 02115, U.S.A. 



WOELLWARTH, C. v. Dr.phil. — Heiligenberg Inst., 7799 HEILIGENBERG. Baden. 

 W.Germany • 



a Autonome Musterbildung in der Medullarplatte. (Amphibia) 



b Determination der Kopforgane. (Amphibia) 



c Entstehung von Situs inversus durch Defekte und verschiedene aussere Einfliisse. (Uro- 

 dela) 



WOERDEMAN. M. W. M.D.. Prof. (Emer.) — Anat.-Embryol. Inst., Univ. of Amsterdam, 

 Mauritskade 61, AMSTERDAM-O., Netherlands • 



a Lens development. (Aves; Mammalia) 



^ 187 



