NEWTH. D. R. Ph.D., Prof. — Dept. of Zool., The University, GLASGOW W2, Scot- 

 land, 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., Prof. — Lab. of Biochem. Embryol., Inst, of Developmental 



Biol., Acad, of Sci. of the U.S.S.R., Vavilov St. 26, MOSCOW V-133, U.S.S.R. 

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

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

 h Enzyme studies during limb regeneration. Bufo spec, Rana spec. (Anura) 

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



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

 d Role of thyroid and adrenal hormones in larval limb regeneration. Bufo spec, Rana spec. 



(Anura) 

 e Nerves in regeneration of limbs. Bufo spec, Rana spec. (Anura) 

 f Development of the spinal cord in larvae (histological and histochemical). Bufo spec, 



Rana spec (Anura) 

 NICOLET, G. D.Sc — Lab. d'Embryol. Exper., Inst. d'Histol., Univ. de Geneve, 20 rue 



de I'Ecole de Medecine, 1211 GENEVE 4, Switzerland • 



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) 

 c Role of Hensen's node in somitic differentiation. (Aves) 

 NIE, C. J. van D.V.M. — Lab. of Anat. and Embryol., Free Univ., v. d. Boechorstst. 7, 



AMSTERDAM, Buitenveldert, Netherlands 

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

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

 c Pathological development of bone. Sus scrofa (Artiodactyla) 

 d Neonatal circulation. Sus domesticus (Artiodactyla) 

 e Teratology. (Mammalia), Homo sapiens (Primates) 

 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, biophysical and histo- 

 chemical analysis of morphogenetic interactions during early development. Ambysfoma 



mexicanum (Urodela) (in collaboration with Miss E. C. BOTERENBROOD, J. G. 



BLUEMINK, P. Th. M. van der SAAG. S. W. de LAAT and Miss G. A. UBBELS) 

 b The induction of the mesoderm in the blastula and the origin of the dorso-ventral polarity 



of the egg. Ambystoma mexicanum (Urodela) 

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



(Urodela), Rana pipiens (Anura) 

 d Causal analysis of early development. Locusta migratoria, Gryllus domesticus (Orthoptera) 

 NIGON, V. Dr.es Sci., Prof. — Sect, de Biol. Gener. et Appl., Fac. des Sci. de Lyon, 



43 Bd. du 11 Novembre 1918, 69 VILLEURBANNE, France 

 a Metabohsme dans les diverses phases de revolution. Euglena gracilis (Euglenophyceae) 

 b Differenciation des erythrocytes. Gallus domesticus (Aves) 

 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 (113) Japan 

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



(Anura) 

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



norvegicus albinus, 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 tissue. Rana catesbeiana. R. japonica, Bufo vulgaris (Anura), Mus 



musculus, Rattus norvegicus (Rodentia) 

 NIKITIN, N S. Dr. — Dept. of Embryol., Leningrad Univ., Mendeleevsky St. 5, LENIN- 

 GRAD B-164, U.S.S.R. 

 a Morphogenetic potentiality of somatic cells. Ephydatia fluviatilis (Porifera) 

 h Separation of different cell types (centrifugation, filtration, micro-manipulation). fPori- 



fera) 

 c Development of culture media for dissociated cells. (Porifera) 

 NIKITINA, Mrs. L. A. — Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., Vavilov 



St. 26, MOSCOW B-133, U.S.S.R. 

 a Analysis of developmental potencies of nuclei in sequential stages of oogenesis by means 



of their transplantation into enucleated eggs. ( Acipenseridae, Chondrostei; Amphibia) 

 h The influence of fractionated homogenates of some differentiating tissues (retina, muscle 



etc.) on the differentiation of future ectoderm in uncleaved eggs and early stages of 



cleavage. Triturus taeniatus (Urodela), Gallus domesticus (Aves) (in collaboration with 



G. V. LOPASHOV) 



127 



