Nich 67 Nishih 



d. Determination times of tissues and organs. Mas norvegicus (Rodentia) 

 c. Factors underlying embroynic form, 

 f. Skeletal regeneration. (Amphibia) 

 NICOLA, Marina De Dr.Sci. — 1st. di Genet, dell'llniv., Fac. de Sci., Via 

 Mezzocannone 8, NAPOLI, Italia. 



a. Investigations on the physiological role of the pigment in morphogenesis: 

 (1) Changes in the total content of pigment in morphogenesis (in coope- 

 ration with A. MONROY and Mrs A. MONROY— ODDO); (2) The 

 chromoprotein of the pigment granules (in cooperation with A. MON- 

 ROY); (3) The metabolism of the pigment during morphogenesis (in 

 cooperation with A. MONROY and E. SCARANO). Paracentrotus 

 lividus (Echinoidea) 



b. An analysis of the pigments in the eggs and in the gonads. Paracentrotus 

 lividus (Echinoidea) (in cooperation with Mrs A. MONROY — ODDO) 



NICOLETTI. B. — 1st. di Biol, gen., Fac. di Med., S. Pietro, PERUGIA, 

 Italia, 

 a. Anelli di Liesegang e sviluppo embrionale. Bufo (Anura) 



NIESSING, K. DrMed., Prof. Anat. — Anat. Inst, der Univ., Robert 

 Kochstr. 6, MARBURG/Lahn, Deutschland. 

 a. Entwicklung der autonomen Ganglien. Xenopus (Anura) 



NIEUWKOOP, P. D. Phil.Dr — Hubrecht Lab., Internat. Embryol. Inst., 

 Janskerkhof 2, UTRECHT, Holland. (Temp. -address, only for personal 

 correspondence: c/o Rockefeller Found., 49W, 49th Street, NEW- 

 YORK 20, U.S.A.) 



a. Early development from fertilization till end of neurulation. Xenopus 

 laevis (Anura) (Normal Table) 



b. The influence of chloramine-compounds on the early development (neu- 

 rulation and formation of the central nervous system). Triturus alpestris 

 and Tr. taeniatus (Urodela) (in collaboration with F. E. LEHMANN) 



c. Analysis of the regulative potencies of the invaginating archenteron roof 

 and the induced neural plate along the dorso-ventral and craniocaudal 

 axes, by heteroplastic transplantation of parts of the dorsal blastoporal 

 lip. Triturus alpestris, taeniatus and cristatus (Anura) (in collaboration 

 with S. TOIVONEN) 



d. Analysis of the neural induction. Transfer of activating substances in 

 horizontal direction through folds of presumptive gastrula ectoderm and 

 subsequent organisation of a nervous system, (heteroplastic implantation 

 of presumptive gastrula ectoderm in gastrulae and neurulae) Triturus 

 taeniatus, alpestris and cristatus and Amblystoma mexicanum (Urodela) 

 (in collaboration with Miss A. KREMER. Miss E. C. BOTEREN- 

 BROOD, Miss F. F. S. N. BLOEMSMA, Miss L. HOESSELS, Miss 

 C. LINGBEEK. G. MEYER, F. J. VERHEYEN. J. WILLEMSEN) 



e. Experimental analysis of the gastrulation process (vital staining and 

 transplantation). Xenopus laevis (Anura) 



f. Experimental analysis of the neurulation process. Xenopus laevis (Anura) 



(in collaboration with Miss M. F. C. van EGMOND) 

 NISHIHARA. T. — Dept of Zool., Univ. of Cahfornia, LOS ANGELES 24, 

 Cal., U.S.A. 

 a. Serological studies of nuclei from various organs and its significance 

 for the general theory of differentiation, (in collaboration with A. M. 

 SCHECHTMAN) 



