by younger ones; 2. leaf regeneration following bipartition of primordium in different 



planes; 3. apical dominance due to young expanding leaves: effect of culture condi- 

 tions, cytological changes. Gleditsia triacanthos (Leguminosae) 

 b Effect of leaf primordia, lateral inflorescence primordia and apical meristem on flowering. 



Pisum sativum (Leguminosae) (with Z. AFZAL) 

 c Determination on flower bilaterality (microsurgical method). Pisum sativum (Leguminosae) 



(with Z. AFZAL) 

 NEW D. A. T. Ph.D. — Marshall Lab., Dept. of Physiol., Univ. of Cambridge, Downing 



St.. CAMBRIDGE CB2 3EG, England • 



a Study of embryos developing in vitro. (Mammalia) 

 NEWBURGH R. W. Ph.D., Prof. — Dept. of Biochem. and Biophys., Fac. of Sci., Oregon 



State Univ., CORVALLIS, Ore. 97331, U.S.A. 

 a Chemical and biochemical changes during development. (Insecta) 

 NEWSOME, D. A. M.D. — Lab. of Vision Research, Natl. Eye Inst., Natl. Inst, of Health, 



BETHESDA, Md. 20014, U.S.A. 

 a Role of the pigmented epithelium of the retina in the induction of the vascular and 



avascular coats of the eye. Gallus domesticus (Aves) 

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



U.K. • 



NEYFAKH, A. A. Dr.biol.sci., Prof. — Lab. of Biochem. Embryol., Inst, of Developm. Biol., 



Acad, of Sci. of the U.S.S.R., Vavilov St. 26, MOSCOW 117133, U.S.S.R. 

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

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

 b Influence of hypo- and hypervitaminosis A on ontogenetic and regenerative development 



in embryos and larvae. Bufo spec, Rana spec. (Anura), Gallus domesticus (Aves) 

 c Role of thyroid and adrenal hormones in larval limb regeneration. Same species as a 

 d Development of the spinal cord in larvae (histology and histochemistry). Same species as a 

 e Morphological and physiological differentiation of the retina and its growth from embryo 



through adult. Same species as a 

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



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



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



labelled with tritiated thymidine. Gallus domesticus (Aves) 

 b Investigations of the primary induction process with the help of labelled precursors. 



(Aves) 

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

 d Subcellular changes during early morphogenesis (electron microscopy). (Aves) (with }. 



GALLERA) 

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

 NIELSEN, CI. mag. sci. — Marine Biol. Lab., Univ. of Copenhagen, Strandpromenaden, 



DK-3000 HELSING0R, Denmark 

 a Life histories; comparison with Ectoprocts; phylogenetic implications. Loxosoma spec, 



Loxosomella spec, Pedicellina spec, Barentsia spec. (Endoprocta) 

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



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



a The induction of the mesoderm and its cranio-caudal and dorso-ventral organization. 



Ambystoma mexicanum, Triturus alpestris (Urodela) (with E. C. BOTERENBROOD) 

 b The origin of the dorso-ventral polarity of the egg. (Amphibia) (with J. G. BLUE- 

 MINK, K. HARA, and G. A. UBBELS) 

 NIGON, V. Dr.es Sci., Prof. — Sect, de Biol. Gener. et Appl., Univ. de Lyon I, 43 Bd. du 



11 Novembre 1918, 69 VILLEURBANNE, France 

 a Metabolisme dans les diverses phases de 1'evolution. Euglena gracilis (Euglenophyceae) 

 b Differenciation des erythrocytes. Gallus domesticus (Aves) 

 NIIZIMA, M. M.D., Ph.D., Prof. — Dept. of Anat., Tokyo Med. and Dental Univ., 1-5-45, 



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. Rattus 



nocvegicus, 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, Xenopus laevis 



(Anura), Mus musculus, Rattus norvegicus (Rodentia) 



132 



