Nich 



68 Nieuwk 



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

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



a. Studies on the egg. Mus norvegicus (Rodentia) 



b. The development of actomyosin in developing muscle. Mus norvegicus 



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

 Ambystoma piinctaturn (Urodela) 



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



e. Factors underlying embryonic form. 



f. Development of nucleic acids in embryos. Mus norvegicus (Rodentia), 



(Amphibia) 



g. Development of acidphosphatase. Mus norvegicus (Rodentia) (Am- 

 phibia) 



h. Centrifugation and transplantation of eggs. Mus norvegicus (Rodentia) 

 j. Culture of eggs and embryos. Mus norvegicus (Rodentia) 

 NICOLA, Mis M. DE Dr Sci. — Centro di Studio per la Biol, del C.N.R., 

 Stazione Zool., NAPOLI, Italia 

 a. Continued investigations on the role of pigment in morphogenesis. (Echi- 

 nodcrmata) (in cooperation with A. MONROY) 

 NICOLETTI, B. Dott. — 1st. di Biol. gen.. Fac. di Med., S. Pietro. PERU- 

 GIA. Italia 

 a. Anclli die Liesegang e sviluppo embrionale. Bufo (Anura) 

 h. Perossidasi ed emoglobina durante lo sviluppo embrionale. Bufo vulgaris 

 (Anura) 

 NIESSING, K. Dr Med., a.o. Prof. — Anat. Inst, der Univ., Robert Koch- 

 str. 6, MARBURG,Lahn, Deutschland 

 a. Entwicklung der autonomen Ganglien. Xenopus (Anura) 

 NIEUWENHUIS. R. — Anat.-Embryol. Lab., Free Univ., Pr. Hendriklaan 

 27, AMSTERDAM Z, Holland 

 a. Influence of influenza-virus during pregnancy on the developing embryo. 

 Mus musculus (Rodentia) (in collaboration with J. LANGMAN) 

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

 Janskerkhof 2, UTRECHT. Holland 



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

 and the induced neural plate along the dorso-ventral and cranio-caudal 

 axes, by heteroplastic transplantation of parts of the dorsal blastoporal 

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

 with S. TOIVONEN) 



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

 transplantation). Xenopus laevis (Anura) 



c. Descriptive and experimental analysis of the ..germinal plasm" in the 

 egg. Xenopus laevis (Anura) 



d. Analysis of the neural induction and subsequent organization of the 

 central nervous system (to be continued). Interaction of embryonic fields. 

 Various species (Urodela) 



e. Analysis of the changes in neural and epidermal competence of the 

 ectoderm during development. Ambystoma mexicanum (Urodela) 



{. Analysis of the neural induction and subsequent organization of the 



central nervous system. Gallus domesticus (Aves) 

 g. Electron-microscopical analysis of induction and activation of the central 



nervous system. Gallus domesticus (Aves) 



