Ulr-Ver 



a. Study of certain features of developing embryos using electronmicro- 

 graphs. (Diptera) (in collaboration with Miss M. M. PERRY and C. H. 

 WADDINGTON) 

 ULRICH, H. Dr.phil., Prof. — Zool. Inst, der Eidg. Techn. Hochschule, Uni- 

 versitatsstr. 2, ZttRICH, Schweiz 



a. Action of X-rays on nucleus and cytoplasm of eggs, and on embryonic 

 stages. Drosophila melanog aster (Diptera) 



b. Morphology, physiology and cytology of paedogenetic-bisexual repro- 

 duction cycle. Heteropeza pygmaea ( — Oligarces paradoxus) , Miastor 

 metraloas, Mycophila nikoleii, Tekomyia populi (Itonididae = Cecido- 

 myidae, Diptera) 



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

 rino, 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) 



c. Enzimologia e biochimica delle rigenerazioni. (Evertebrata; Vertebrata) 

 URBANI (MISTRUZZI), Mrs. L. Prof. Inc. — 1st. di Zool. e Anat. Comp., 



Univ. di Camerino, CAMERINO, Italia 

 a. Biochemistry of regeneration. Tubularia spec. (Hydroidea) 

 URSPRUNG, H. Ph.D. — Dept. of Biol., Johns Hopkins Univ., Charles and 

 34th Sts., BALTIMORE 18, Md., U.S.A. 



a. Biochemical studies on differentiation. Drosophila melanogaster (Dip- 

 tera), Rana pipiens (Anura) , Mus musculus (Rodentia) 



b. Organization of imaginal discs. Drosophila melanogaster (Diptera) 

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



bertov 4, PRAHA 2, Czechoslovakia 

 VAHS, W. Dr.phil. — Zool. Inst, der Univ. Koln, Kerpenerstr. 13, K6LN- 

 Lindenthal, Deutsche Bundesrepublik 



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

 bia; Aves) 



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

 VAINIO, E. T. M.D. — Dept. of Physiol.Zool., Univ. of Helsinki, Arkadian- 



katu 7, HELSINKI, Finland 



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

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



b. Viral resistance and kidney tubulogenesis. Mus musculus (Rodentia) 

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



VAKAET, L. C. M.D., M.I.I.E., Prof. — 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 albinus (Rodentia) 

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



FAYETTE, Ind., U.S.A. 



a. Studies of skin gland development during metamorphosis by combining 

 techniques of organ culture, biochemistry, autoradiography, histochemistry 

 and electron microscopy. Xenopus laevis (Anura) 



b. The action of thyroxin on unmetamorphosed skin (skin gland develop- 

 ment). Xenopus laevis (Anura) 



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