Niu 66 Okad 



d. The transformation of differentiated xanthophores into typical melano- 

 phores. (Amphibians) (in collaboration with V. C. TWITTY) 



e. The differentiation of single isolated gastrula ectoderm cells cultured 

 under special conditions in vitro. (Amphibians) (in collaboration with 

 V. C. TWITTY) 



f. The migratory behaviour of single neural crest melanoblasts isolated in 

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

 with V. C. TWITTY) 



NOVIKOFF, A. B. Ph.D., Prof. — Dept of Anat, Univ. of Vermont, 



Coll. of Med., BURLINGTON, Vt, U.S.A. 



(no data received over this year) 

 NUESCH, H. DrSc, P.D. — Zool. Anstalt der Univ., Rheinsprung 9, 



BASEL, Schweiz. (no data received over this year) 



NIJENHUIS, E. D. — Zool. Lab. der Rijks Univ., Janskerkhof 3, UTRECHT, 



Holland, 

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

 boration with G. A. van ARKEL, Miss E. v. d. BROEK, Mrs A. S. 



DUYKER— de BEER, Miss W. H. T. van HEESCH, J. C. N. KOK, 



J. W. KUIPER, Miss R. P. van LOO, Miss J. E. H. SMIT and 



W. L. van UTRECHT) 

 NIJENHUIS, L. E. — Zool. Lab. der Rijks Univ., Janskerkhof 3, UTRECHT, 



Holland, 

 a. Developmental physiology of mutants. Drosophila melanogaster (Insecta) 



(in collaboration with Miss E. C. BOTERENBROOD, F. J. OPPEN- 



OORTH and N. SPRONK) 

 NYHOLM, K. G. Fil. Dr — Uppsala Univ., Zool. Inst., UPPSALA, 



Sweden. 



a. Development of the Echinoderids. (Vermes) 



b. Development of Labidoplax buskii. ( Echinodermata) 



O'BRIEN, J. P. Ph.D. — Dept of Biol., Marquette Univ., 1131, West 

 Wisconsin Ave, MILWAUKEE 3, Wis., U.S.A. 



a. Etablishment of anuran renal carcinoma in Urodeles. (Amphibia) 



b. Influence of Urodele limb field on anuran cancerous cells. Rana pipiens, 

 Triturus viridescens and Amblystoma spp. (Amphibia) 



c. Regeneration in Urodele limb portions situated in reversed proximo- 

 distal polarity. (Amphibia) 



d. State of determination of the amphibian limb blastema. Triturus viri- 

 descens, Rana pipiens and Amblystoma spp. 



O'CONNOR, R. J. M.D., D.T.M. — Westminster Med. School, Horsferry 

 Rd, LONDON S.W. 1, England, 

 a. The metabolism of cell division and cell differentiation. Vertebrates 

 ODfi, Miss E. Arts — Anat.-Embryol. Lab. of the Univ. of Leyden, Fac. 

 of Med., Boerhaavekwartier, Wassenaarseweg, LEIDEN, Holland, 

 a. Development of large vessels, especially pulmonary vessels, aorta and 

 ductus arteriosus Botalli. Rat and Man (Mammals) 

 OKADA, T. — Lab. of Embryol. and Exper. Morphol., Zool. Inst., Dept 

 of Sci., Kyoto Univ., KYOTO, Japan. 



a. Developmental mechanism of entoderm differentiation. Triturus pyrrho- 

 gaster and Hynobius nebulosus (Amphibia) 



b. Role of the yolk mass in early morphogenetic movement. Triturus pyrrho- 

 gaster and Hynobius nebulosus (Amphibia) 



