NEUMANN, D. Dr.rer.nat. — Zool. Inst, der Univ., Rontgenring 10, WuRZBURG, Deut- 

 sche Bundesrepublik 

 a Lunar periodicity of metamorphosis. Clunio marinus (Chironomidae, Diptera) 

 NEW, D. A. T. Ph.D. — Dept. of Physiol.. Univ. of Cambridge, CAMBRIDGE, England 

 NEWBURGH, R. W. Ph.D., Prof. ~ Science Research Inst., Oregon State Univ., CORVAL- 



LIS, Ore. 97331, U.S.A. 

 a Chemical and biochemical changes during development. 

 • NEWTH, D. R. Ph.D., Prof . — Dept. of Zool., The University, GLASGOW W.2, 



Scotland, U.K. 

 a Regeneration of defective organs. (Amphibia) 



b Activity of grafted spleens against organ-specific antigens. Xenopus laevis (Anura) 

 NEYFAKH, A. A. Dr. biol.sci. — Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., 



Vavilov St. 26, MOSCOW V-133, U.S.S.R. 

 a Nucleo-cytoplasmic interaction in development: the role of the nucleus in biochemical 



differentiation. Misgurnus fossilis (Cobitidae, Teleostei) 

 h Mitochondria in development. 

 c The action of antibiotics and nucleotide analogues on development. Strong gylocentrotus 



nudus, S. intermedins (Echinoidea) 

 d Protein and RNA synthesis in development. Strong ylocentrotus nudus, S. intetmedius 



(Echinoidea), Misgurnus fossilis, Carassius auratus (Teleostei) 

 e Biochemistry of development of hybrids, haploids etc. Misgurnus fossilis, Carassius auratus 



(Teleostei) 

 NIAZI, I. A. Ph.D. — Dept. of Zool., Univ. of Rajasthan, JAIPUR, India 

 a Limb and tail regeneration. Bufo spec, Rana spec. (Anura) 

 b Enzyme studies during limb regeneration. Bu}o spec, Rana spec. (Anura) 

 c Differentiation of neural plate into tail mesoderm. Ambystoma mexicanum (Urodela) 

 d Lens regeneration in embryos in vitro. Gallus domesticus (Aves) 

 e Influence of hypo- and hypervitaminosis A on development (ontogenetic and regenerative) 



in embryonic and larval stages. Bufo spec, Rana spec. (Anura), Gallus domesticus (Aves) 

 NICOLET, G. D.Sc — Lab. d'Embryol. exper., Inst. d'Anat., Fac de Med.. Univ. de 



Geneve, 20 Rue de I'Ecole de Medecine, GENEVE, Suisse 

 a Studies of the fate of the different parts of the primitive streak with the help of grafts 



labelled with tritiated thymidine. Gallus domesticus (Aves) 

 h Investigations of the primary induction process with the help of labelled precursors. (Aves) 

 NIE, C. J. van D.V.M. — Veter. Anat. and Embryol. Inst., State Univ. of Utrecht, Bekker- 



str. 141, UTRECHT, Netherlands 

 a Ontogenetic malformations of the heart. Sus scro[a. Bos taurus (Artiodactyla) 

 b Pathological development of heart and vessels. Sus scrofa. Bos taurus (Artiodactyla) 

 c Pathological development of bone. Sus scrofa (Artiodactyla) 

 • NIEUWKOOP, P. D. Phil.Dr., Prof . — Hubrecht Lab. (Intern. Embryol. Inst.). Uppsala- 



laan 1, Universiteitscentrum "De Uithof", UTRECHT, Netherlands 

 a Experimental-morphological, electron-microscopical, biochemical, and histochemical anal- 

 ysis of neural and mesodermal competence of the ectoderm in the blastula/gastrula stage. 



Ambystoma mexicanum (Urodela) (in collaboration with J. G. BLUEMINK, P. Th. M. 



van der SAAG and Miss G. A. UBBELS) 

 b The segregation of ecto-, meso- and endoderm in the blastula. Ambystoma mexicanum 



(Urodela) 

 c Pattern formation in artificially activated ectoderm. Ambystoma punctatum, A.mexicanum, 



Rana pipiens (Amphibia) 

 d Analysis of pattern formation in the prosencephalic portion of the neural plate in normal 



development. Triturus spp. (Urodela) (in collaboration with Miss E. C. BOTEREN- 



BROOD) 

 e Causal analysis of early development. Locusta migratoria, Gryltus domesticus (Octhoptera) 

 NIGON, V. Dr.es Sci., Prof. — Section de Biol, generale et appliquee, Fac. des Sci., Univ. 



de Lyon, 43, Bd. du 11 Novembre 1918, 69-VILLEURBANNE, France 

 a Metabolisme des acides nucleiques durant la gametogenese et le developpement. Parascaris 



equorum (Nematoda), Drosophila melanogaster (Diptera), Bombyx mod, Galleria mel- 



lonella (Lepidoptera), Arbacia lixula (Echinoidea) 

 b Metabolisme dans les diverses phases de revolution. Euglena gracilis (Flagellata) 

 NIIZIMA, M. M.D., Ph.D., Prof. — Dept. of Anat., Fac. of Med., Tokyo Med. and Dental 



Univ., 1-5-47, Yushima, Bunkyo-ku, TOKYO, Japan 

 a Tissue culture studies on metamorphosis. Rana catesbiana, R. japonica, Bufo vulgaris 



(Anura) 

 b Tissue culture studies on the development and differentiation of dental tissues. Rattus 



norvegicus albus, Felis domestica. Homo sapiens (Mammalia) 

 c Tissue culture studies on cell differentiation. Gallus domesticus (Aves) 

 d Identification of fibroblasts in tissue culture. Gallus domesticus (Aves), Rattus norvegicus. 



Homo sapiens (Mammalia) 

 e Transplantation of tissues. Rana catesbiana, R. japonica, Bufo vulgaris (Anura). Mus 



musculus, Rattus norvegicus (Rodentia) 



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