Twitty 92 Vand 



a. The differentiation of macrophaqes into melanophores following their 

 ingestion of pigmentary debris released by degeneration of preexisting 

 melanophores. (Amphibia) (in collaboration with M. C. NIU) 



b. The migratory behaviour of single neural crest melanoblasts isolated 

 in capillary tubes of extremely small bore. (Amphibia) (in collaboration 

 with M. C. NIU) 



c. The differentiation of gastrula-ectoderm in medium conditioned by axial 

 mesoderm. (Amphibia) 



TYLER A. F.I.I.E.. Ph. D.. Prof. — Dept of Embryo!., Div. of Biol., Calif. 

 Inst, of Technol.. PASADENA 4, Cal., U.S.A. 



a. Physiology of fertilization. (Echinoidea) 



b. Physiology of early development. (Echinoidea and Polychaeta) 



c. Life-span, motility and metabolism of spermatozoa. ( Echinodermata. 

 Annelida. Mollitsca. Ai'cs and Mammalia) 



UBLSCH, L. V. F.LLE.. Dr jur. ct phil.. Prof. (Emcr.) — PARADIS, Norge. 



a. Untersuchungen iiber Pleuronectiden. IIL (Pleuronectidae. Tcleostei) 



b. Die Bcdeutung von Metamorphose, Generationswechsel und Poly- 

 morphismus fiir die Abstammungslehre. 



UCHIDA. T. Rigakushi (M.S.), Rigakuhakushi (Dr), Prof. — Zool. Inst.. 



Fac. of Sci.. Hokkaido Univ.. North 8. West 5. SAPPORO, Japan 



(no data received on Nov. l"'. 1953) 

 ULRICH, H. Dr Phil. — Zool. Inst, der Univ. Gottingen, Mathem.- 



Naturw. Fak., Bahnhofstr. 8, GOTTINGEN. Deutschland 

 a. Strahlenwirkung in der Embryologie. Drosophila melanogaster (Dip- 



tera) 

 URBANI. E. Lib. Doc. Anat. Comp., Biol, e Genet. — 1st. di Anat. Comp. 



deirUniv., Fac. di Sci., Via Borelli 50, ROMA. Italia 



a. Azione degli antimitotici sul metabolismo respiratorio. (Amphibia) 



b. Ricerche sui determinanti germinali. (Insecta) 



c. Ricerche sull'acido ribonucleico delle fasce vitellogene e dei nuclei 

 vitellini. (Echinodermata. Arachnoidea, Myriopoda e Mammalia) 



d. Ricerche sugli enzimi nella vita latente. (Phyllopoda. Crustacea) 



e. Ricerche sugli enzimi negli eritrociti. (Vertebrata) 

 URBANI^MISTRUZZl, Mrs L. Dott. — 1st. di Anat. Comp. deirUniv.. 



Fac. di Sci.. Via Borelli 50, ROMA. Italia 

 a. Ricerche sulle parabiosi. (Anura and LIrodela) 

 h. Ricerche sulle formazioni ergastoplasmatiche e sul ciclo secretorio. 



(Piilmonata. Gastropoda) 

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



LINDENTHAL. Deutschland 



a. Die Beeinflussbarkeit der Leistungsspezifitat abnormer Induktoren in 

 der Entwicklung. (Amphibia) 



b. Quantitative Nuclcinsaurcanalysen vom Gewebc abnormer Induktoren. 

 Tritiinis (LIrodela) . Miis musculus (Rodentia) 



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

 Bylokekaai 1, GENT. Belgium 

 a. Cytochemistry of ovocytes. Lebistes reticulatus (Teleostei) 

 VANDEBROEK. G. Dr Sc, Prof. — Lab. d'Embryol., Inst, de Zool., Univ. 

 dc Louvain. 71 Rue de Namur, LOUVAIN, Belgique 

 (no data received over some years) 



