Weng 95 Williams 



a. Cytological and cytochemical studies of the developing duodenum. Gal- 

 lus domesticus (Aves) (in collaboration with F. MOOG) 



b. Cytochemical and microchemical study of the developing nervous system 

 and its relationship to developing behaviour patterns. Ambystoma macu- 

 latum (Urodela) (in collaboration with P. G. ROOFE) 



WESTHUIZEN. C. M. v. d. M.Sc. — Zool. Inst.. Univ. of Stellenbosch. 



STELLENBOSCH, S. Africa, 

 a. Ontogenesis of the skull. Heleophryne purcelli (Anura) 

 WESTRA. S. — Anat.-Embryol. Lab. der Rijks Univ., Oostersingel 69, 



GRONINGEN. Holland. 



a. Embryological development of the roof of the fourth ventricle. Homo 

 (Primates) 



b. Neurosecretion in the brain. Rana, Amblystoma (Amphibia) 

 WETMORE, R. H. Ph.D., D.Sc, Prof. — Biol. Lab.'s, Harvard Univ., 



Divinity Ave. CAMBRIDGE 38. Mass., U.S.A. 



(no data received over this year) 

 WHITAKER, D. Dr, Prof. — Stanford Univ., PALO ALTO. Cal., U.S.A. 



(no data received) 

 WHITELEY, A. H. Ph.D.. Prof. — Dept of Zool.. Univ. of Washington. 



SEATTLE 5, Wash.. U.S.A. 



(no data received over this year) 

 WICKLUND, Miss E. Ph. lie. — Wenner-Grens Inst, for exper. Biol., 



Norrtullsgatan 16, STOCKHOLM 23, Sweden. 

 a. On fertilizability of the egg under different conditions acting on sperm 



and eggs. Psammechinus miliaris, Strongylocentrotus droebachiensis and 



Arbacia lixula (Echinoidea) 

 WIERDA, J. L. B.S., M.S., Ph.D., Asst Prof. — Dept of Anat., School 



of Med., Univ. of Pennsylvania, PHILADELPHIA 4. Pa, U.S.A. 



(no data received over this year) 

 WILENS, Miss S. A.B. — Osborn Zool. Lab., Yale Univ., NEW HAVEN 



11, Conn., U.S.A. 

 a. Vital staining of mesoderm and endoderm under the midbrain and 



hindbrain and adjacent ventral regions. Amblystoma punctatum (Uro- 

 dela) 

 WILLEMSEN, J. — Hubrecht Lab., Internat. Embryol. Inst., Janskerkhof 2, 



UTRECHT, Holland, 

 a. Analysis of the neural induction. Transfer of activating substances in 



horizontal direction through folds of presumptive gastrula ectoderm and 



subsequent organisation of a nervous system, (heteroplastic implantation 



of presumptive gastrula ectoderm in gastrulae and neurulae) Triturus 



taeniatiis, alpestris and cristatv.s and Amblystoma mexicanum (Urodela) 



(in collaboration with P. D. NIEUWKOOP. Mis A. K. KREMER, Miss 



E. C. BOTERENBROOD, Miss F. F. S. N. BLOEMSMA. Miss L. 



HOESSELS. Miss C. LINGBEEK, G. MEYER and F. J. VER- 



HEYEN) 

 V/ILLIAMS. R. G. A.B.. M.A.. M.D., Prof. — Dept of Anat.. School of 



Med.. Univ. of Pennsylvania, PHILADELPHIA 4, Pa, U.S.A. 



a. Studies on growth of various implanted tissues with the rabbit's ear 

 chamber technique. (Mammalia) 



b. Development of bone marrow in rabbit's ear tissue chambers. (Mam- 

 malia) 



