Verh 92 Wae 



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

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

 LINGBEEK, G. MEYER and J. WILLEMSEN) 



VERMAAK, D. B.Sc. — Zool. Inst., Univ. of Stellenbosch, STELLEN- 

 BOSCH. S. Africa, 

 a. Ontogenesis of commissural connexions of the vena pudenda externa 

 and V. p. interna in an advanced embryo. Homo sapiens (Primates) 



VIGLIANI, F. Dr — Inst, of human Anat., Corso Massimo d'Azegho 52, 

 TORINO, Italy, 

 a. Late development and growth of bones, joints and muscles in mechani- 

 cally inert and denervated hmbs. Canis familiaris (Carnivora) 



VILLAFRANCA, G. W. de B.S. — Osborn Zool. Lab., Yale Univ., NEW 

 HAVEN 11, Conn., U.S.A. 

 a. Studies of various enzyme fractions in developing muscle in relation to 

 the development of contractibihty. Mas norvegicus albinus (Rodentia) 

 (under direction of E. J. BOELL) 



VINTEMBERGER, P. Dr Med. — Inst. d'Embryol. et de Morphol exper., 

 Fac. de Med., 1 Place de I'Hdpital, STRASBOURG, (Bas-Rhin), 

 France, 

 a. Recherches sur le determinisrne de la symetrie bilaterale chez les Verte- 

 bres. (Amphibia) 



VITAGLIANO, G. Dr Sc. — 1st. di Genet. dell'Univ. di Napoh, Fac. di 

 Sci., Via Mezzocannone 8, NAPOLI, Itaha. 

 (no data received over this year) 



VOGT, Miss M. M.D. — Hirnforschungs-institut, NEUSTADT, Schwarz- 

 wald, Germany (present address: Dept of Biol., Cahf. Inst, of Technol., 

 PASADENA 4, Calif., U.S.A.) 

 (no embryological work planned for 1951) 



VROMAN. M. — Zool. Lab. der Rijks Univ., Janskerkhof 3, UTRECHT, 

 Holland, 

 a. Analysis of hthium action. Limnaea stagnalis (Gastropoda) (in colla- 

 boration with W. G. BRAAMS, A. C. J. BURGERS. P. F. ELBERS, 

 W. L. M. GEILENKIRCHEN, J. ISINGS, Miss T. C. M. KOE- 

 VOETS, Chr. P. RAVEN and G. SCHOLTEN) 



WADDINGTON, C. H. F.R.S., M.A.. Sc.D.. Prof. — Inst, of Anim. 

 Genetics. West Mains Rd., King's Buildings, EDINBURGH 9, Scot- 

 land (U.K.) 



a. Regional specificity in hving and dead organizers. Triton alpestris 

 (Urodela) Aves) 



b. Cinematographic study of morphogenetic movements. (Amphibia and 



c. Transplantation of cell constituents. Triton alpestris (Urodela) 



d. Developmental effects of some genes. Drosophila melanogaster (Insecta) 



e. Study of abnormal embryos induced by injecting trypan blue into 

 pregnant animals. Mus musculus (Rodentia) (in collaboration with T. 

 C. CARTER) 



f. Inductive power of area pellucida material. Gallus domesticus (Aves) 



(in collaboration with E. M. DEUCHAR and S. MOOKERJEE) 

 WAECHTER. Miss H. Dr rer.nat. — Heiligenberg Inst. (Abtlg Mangold), 

 (17b) HEILIGENBERG, Kreis Ueberlingen/Bodensee, Deutschland. 

 a. Determinationsvorgange in der Gastrula und Neurula. Triton (Urodela) 

 (gemeinsam mit O. MANGOLD) 



