Newton 65 Niu 



c. Investigation of transplantability of the Brown-Pearce tumor, utilizing 

 the yoke sac of chicks and the anterior ocular chamber of rabbits. 

 Morphological changes will be studied, and as well the effect on the 

 tumor of various chemical agents will be studied. (Aves and Mammalia) 

 (in collaboration with I. GALINSKY) 

 NICHOLAS, J. S. Ph.D. Prof. — Osborn Zool. Lab., Yale Univ., NEW 

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



a. Studies on the rat egg. Mus norvegicus (Mammalia) 



b. The development of rat muscle. Mus norvegicus (Mammalia) 



c. The development of actomyosin in developing rat muscle. Mus nor- 

 vegicus (Mammalia) 



d. The interaction of the roof of the archenteron upon the nervous system. 

 Amblystoma mexicanum (Amphibia) 



DE NICOLA, M. Dr Sc. — 1st. di Genet. dell'Univ. di Napoli, Fac. de Sci., 

 Via Mezzocannone 8, NAPOLI, Italia. 



a. Calcium distribution in early development of sea urchin eggs. Paracen- 

 trotus and Avbacia 



b. Phosphatase distribution in Crustacean eggs. Cymothoids and Asellus 

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



a. Anelli di Liesegang e sviluppo embrionale. Bufo (Anfibi) Italia. 



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

 Janskerkhof 2, UTRECHT, Holland. 



a. Early development of Xenopus laevis from fertilization till end of neuru- 

 lation. (Anuva) (Normal Table) 



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

 (neurulation and formation of the central nervous system) of the 

 Amphibian egg. Triturus alpestris and Tt. taeniatus (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 cranio- 

 caudal axes in the Amphibian egg by heteroplastic transplantation of 

 parts of the dorsal blastoporal lip. Triturus alpestris, taeniatus and 

 cristatus (in collaboration with S. TOIVONEN) 



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

 horizontal direction through presumptive ectoderm and subsequent or- 

 ganisation of a nervous system, (heteroplastic transplantation of ecto- 

 derm). Triturus taeniatus, alpestris and cristatus (Amphibia) (in col- 

 laboration with Miss A. KREMER and Miss E. BOTERENBROOD) 



e. Experimental analysis of the gastrulation process in the Anuran species 

 Xenopus laevis (Daud.) (vital-staining and transplantation). 



f. Experimental analysis of the neurulation process in Xenopus laevis 



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

 NIU, M. C. Dr — Dept of Biol. Sci., Stanford Univ., STANFORD, Cal., 

 U.S.A. 



a. The differentiation of macrophages into melanophores following their 

 ingestion of pigmentary debris released by degeneration of preexisting 

 melanophores. (A^mphibians) (in collaboration with V. C. TWITTY) 



b. The origin of chromatophores of the salamander tail. (Amphibians) (in 

 collaboration with V. C. TWITTY) 



c. Factors influencing pigment differentiation in amphibian melanoblasts. 

 (in collaboration with V. C. TWITTY) 



