URBANI. E. M.I. I.E., Prof. — 1st. di Zool. e Anat. Compar., Univ. di Ca- 

 merino, CAMERINO, Italia 



a. Biochimica dello sviluppo embrionale e della metamorfosi. (Insecta, Am- 

 phibia) 



b. Enzimologia e biochimica delle forme aploidi, diploidi, poliploidi. (Crus- 

 tacea, Mammalia) 



URBANI (MISTRUZZI). Mrs. L. Dott. — 1st. di Zool. e Anat. Compar., 



Univ. di Camerino. CAMERINO, Italia 

 URSPRUNG, H. — Zool.-vergl. Anat. Inst., Naturw. Fak., Univ. Zurich, 



Kiinstlergasse 16. ZURICH 6, Schweiz 

 a. Determination and field organization of imaginal discs. Drosophila me~ 



lanogaster (Diptera) 

 VACEK, Z. MUDr. — Embryolog. ustav lekafske fak. Univ. Karlovy, Al- 



bertov 4, PRAHA II, Czechoslovakia 



a. Development of the innervation of the gonads. Homo sapiens (Primates) 



b. Experimental analysis of the development of the autonomic nervous 

 system. Gallus domesticus (Aves) 



VAHS, W. Dr. Phil. — Zool. Inst, der Univ. Koln, Kerpenerstr. 13, KoLN- 



LINDENTHAL, Deutschland 

 a. Histochemische Untersuchung der Induktionsvorgange. Triturus spec. 



(Uvodela) 

 VAINIO, E. T. M.D. — Zool. Lab., Univ of Helsinki, P. Rautatiekatu 13, 



HELSINKI, Finland 



a. The immunological properties of heterogenous inductors. (Amphibia) 



b. The antigenicity of different germinal layers. Triturus spec. (Urodela) 



c. Heterotransplantation of tumours. 



d. The mechanism of the induction produced by heterogenous inductors. 

 Triturus spec. (Urodela) (in collaboration with S. I. TOIVONEN and 

 L. O. SAXEN) 



VAKAET, L. C. M.D. — Lab. of Anat., Fac. of Med., Univ. of Gent, 

 Bylokekaai 1, GENT, Belgium 



a. Early development. Gallus domesticus (Aves) 



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

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



Zool., Univ. de Louvain, 71 Rue de Namur, LOUVAIN, Belgique 

 VANDERHAEGE (HOUGARDY), Mrs. F. Dr. en Sci. — Lab. de Mor- 

 phol. anim., Univ. libre de Bruxelles, 1850 Chaussee de Wavre, 

 BRUXELLES-Auderghem, Belgique 

 a. Nucleo-cytoplasmic relations in normal and tumour (Ascites) cells. 

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

 LOGNA, Italia 



a. Cycle of the nucleic acids and nucleolar changes during oogenesis. Pis- 

 ces; Amphibia) 



b. Experimental analysis of the causal development of the gonads. (Amphi- 

 bia) 



c. Experimental regeneration and genesis of the germ-cells. (Polychaeta) 

 VENEZIANO, P. P. M.S. — Cresap Biol. Lab., Coll. of Liberal Arts, 



Northwestern Univ., EVANSTON, 111., U.S.A. 



a. An analysis of cartilage induction. Gallus domesticus (Aves) 



b. The incidence of spina bifida following hypophysectomy. Gallus domesti- 

 cus (Aves) 



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