a. Haploid formation. Oryzias latipes (Teleostei) 



b. Tissue culture of embryonic organs. Oryzias latipes (Teleostei) 

 VAAGE. S. M.D. — Anat. Inst.. Univ. of Oslo. OSLO, Norway 



a. Morphogenetic studies on cell migrations in the central nervous system 

 of the embryo by means of autoradiography. Callus domesticus (Aves) 

 VACEK. Z. MUDr.. Dr.Sc, Prof. — Inst, of Embryol.. Fac. of Med. Char- 

 les Univ., Albertov 4. PRAGUE 2, Czechoslovakia 



a. Electron microscopy and histochemistry of the placenta (comparative 

 studies on the submicroscopic structure, enzyme histochemistry and 

 transport mechanism). (Rodentia, Carniuora, Insectivora, Chiroptera), 

 Homo sapiens (Primates) 



b. Role of primitive streak and tail region in early differentiation of the 

 body (submicroscopic and cytochemical studies in normal and experi- 

 mental conditions). Rana esculenta (Anura), Callus domesticus (Aves). 

 Mus tattus (Rodentia) 



VAHS, W. Dr.phil., Doz. — Zool. Inst, der Univ., Kerpenerstr. 13, KoLN- 

 Lindenthal, Deutsche Bundesrepublik 

 a. Quantitative cytochemistry of the induction processes. (Pisces; Amphi- 

 bia; Aves) 

 h. The role of the yolk platelets in the differentiation process. (Urodela) 

 VAINIO, E. T. M.D. — Lab. of Exp.Embryol., Dept. of Physiol.Zool., 

 Univ. of Helsinki, Arkadiankatu 7, HELSINKI, Finland 



a. Mechanism of the primary induction. Triturus spec. (Urodela) (in 

 collaboration with S. I. TOIVONEN and L. O. SAXfiN) 



b. Mechanism of kidney tubulogenesis. Mus musculus (Rodentia) (in col- 

 laboration with S. I. TOIVONEN and L. O. SAXeN) 



VAKAET, L. C. M.D., M.I.I.E.. ProL — Lab. of Anat., Fac. of Med., Univ. 

 of Gent, Bylokekaai 1, GENT, Belgium 



a. Early development. Callus domesticus (Aves) 



b. Fetal and neonatal endocrinology. Mus musculus albinus (Rodentia) 

 VANABLE, J. W., Jr. A.B., Ph.D. — Dept. of Biol.Sci.. Purdue Univ., LA- 

 FAYETTE, Ind.. U.S.A. 



VAN ALTEN, P. J. M.S., Ph.D. — Dept. of Anat., Coll. of Med., Univ. of 

 Illinois, 1853 W .Polk St., CHICAGO 12, 111., U.S.A. 



a. Development of the digestive tract. Callus domesticus (Aves) 



b. Ontogeny of the immunological mechanism. Callus domesticus (Aves) 

 VANDEBROEK, G. Dr.Sc, M.I.I.E. Prof. — Lab. d'Embryol.. Inst, de 



Zool., Univ. de Louvain, 59 Rue de Namur, LOUVAIN, Belgique 

 VANDERHAEGHE (HOUGARDY), Mrs. F. Dr.en Sci. — Station de 



Zool. exper., Univ. de Geneve, Route de Malagnou 154. Chene-Bouge- 



ries, GENEVE, Suisse 

 a. Nuclear transplantation. Xenopus laevis (Anura) 

 VANNINI, E. Dr., M.I.I.E., Prof. — 1st. di Zool., Via S. Giacomo 9. 



BOLOGNA, Italia 



a. Experimental analysis of the development of the gonad and Bidder's 

 organ. Bufo spec. (Anura) 



b. Sexual and asexual reproductive cycles and regeneration. Salmacina 

 incrustans, S. dysteri (Polychaeta) 



c. General study of the problem of the "sex gradient" in various herma- 

 phrodite animals. (Hydroidea, Tricladidea, Turbellaria; Serpulidae. 

 Polychaeta) 



209 



