• SIGNORET. J. Dr.es Sci., Prof, — Lab. d'Embryol.. Fac. des Sci.. Univ. de Caen, 14- 



CAEN, Calvados, France 

 a Study of nuclear differentiation and specific activities by means of nuclear transplantation. 



Ambysfoma mcxicanum (ilrodela) 

 h Study of chromosome changes during cellular differentiation. Ambystoma mexicanum 



(Urodcia) 

 SIGOT. M. Lic.es Sci. — Inst. d'Embryol. et Teratol. exper. du C.N.R.S., 49bis Av. de la 



Belle Gabrielle, 94-NOGENT-sur-Marne. France 



— Lab. d'Embryol. exper. du Coll. de France, 11 Place Marcelin Berthelot, PARIS "Ve. 

 France 



a Morphogenese du tube digestif en culture in vitro. Gallus spec. (Aves) 

 SIGOT (LUIZARD), Mrs. M. F. Lic.es Sci. — Inst. d'Embryol. et Teratol. exper. du 

 C.N.R.S., 49bis Av. de la Belle Gabrielle, 94-NOGENT-sur-Marne. France 



— Lab. d'Embryol. exper. du Coll. de France, 11 Place Marcelin Berthelot, PARIS Ve, 

 France 



a Culture de tissus cancereux sur des organes embryonnaires de poulet cxplantes in vitro. 



Mus musculus, Raffus rattus, Homo sapiens (Mammalia) 

 SILfiN, L. K. P. Fil.Dr.. Prof. — Zool. Inst., Univ. of Stockholm, 70A Radmansgatan, 



STOCKHOLM Va., Sweden 

 a Embryology. (Bryozoa) 

 SILVA MURTA, Mrs. J. M. da B.Sc. — Inst, de Biol. Geral, Fac. de Filos., Univ. de Minas 



Gerais, Rua Carangola 288, Caixa Postal 253, BELO HORIZONTE, Brasil 

 a Embryology of nephridia. Peripafus acacioi (Onychophora) 

 SILVER, P. H. S. Ph.D. — Anat. Dept., Middlesex Hosp. Med. School, LONDON W.l. 



England 

 SIMKISS, K. Ph.D. — Dept. of Physiol, and Biochem., The Univ., READING, England 

 a Comparative studies on Ca and Mg in embryos. 

 SIMONS, J. A. Ph.D. — Dept. of Biol., Coll. of William and Mary, WILLIAMSBURG, Va. 



23185. U.S.A. 

 a Induction of d-aminolevulinate synthetase and the regulation of heme biosynthesis during 



development. Gallus domesticus (Aves) 

 SIMS, R. T. M.A., M.B. — Anat. School, Univ. of Cambridge, CAMBRIDGE, England 

 a Factors affecting differentiation of cells in hair follicles. (Mammalia) 

 SINCLAIR, D. M. M.B., B.Ch. — Dept. of Anat., Med. School, Univ. of the Witwatersrand, 



Hospital St., JOHANNESBURG, S. Africa 

 a Effect of nerve growth factor on myelinization of nerve fibres. Mus musculus (Rodentia) 

 SINCLAIR, J. G. Ph.D., Prof. (Emer.) — Dept. of Anat.. Med. Branch, Univ. of Texas, 



GALVESTON, Tex. 77550. U.S.A. 

 SINGER, M. Ph.D., Prof. — Dept. of Anat.. Developm. Biol. Center, School of Med., 



Western Reserve Univ., 2127 Cornell Road, CLEVELAND, Ohio 44106, U.S.A. 

 a Regeneration. (Mammalia) 

 SINGER, R. D.Sc, Prof. — Dept. of Anat., Univ. of Chicago, 1025 East 57th St., CHICAGO, 



111. 60637, U.S.A. 

 a General embryology. Homo sapiens (Primates) 

 h General embryology. Hysfrix africaeaustralis (Rodentia) 

 SINGH, I. Ph.D. — Dept. of Anat., Med. Coll.. ROHTAK, India 

 a Mitotic rate in argyrophile and argentaffin cells of the embryonic gastrointestinal tract 



Homo sapiens (Primates) 

 SINGH. R. P. Ph.D. — Dept. of Anat., School of Med.. Wayne State Univ., 1400 Chrys- 

 ler Xway, DETROIT, Mich. 48207, U.S.A. 

 a Developmental pathology and teratogenesis. Homo sapiens (Primates) 

 h Histochemical studies of gonadal development. Gallus domesticus (Aves) 

 SINGH-ROY, K. K. Dr.phil. — Cell Research Unit, Dept. of Zool., Univ. of Calcutta, 35, 



Ballygunje Circular Rd., CALCUTTA 19, India 

 SINHA, A. K. Ph.D. — Dept. of Zool., Presidency Coll., CALCUTTA 12, West Bengal, 



India 

 © SIRAKAMI, K. I. D.Sc. — Dept. of Biol., Yamanashi Univ., KOFU, Japan 



• SIRLIN. J. L. Dr.Nat.Sci., Prof. — Dept. of Anat., Med. Coll.. Cornell Univ., 1300 York 



Ave., NEW YORK, N.Y. 10021, U.S.A. 



a Modulation of transfer RNA during metamorphosis. (Diptera) 



SISCA, R. D.D.S., Ph.D. — Dept. of Histol. and Embryol., Coll. of Dental Surgery, Univ. 

 of Maryland, Lombard and Green St., BALTIMORE, Md. 21201. U.S.A. 



a Tooth development (histochemistry and electron microscopy). Homo sapiens. Macaca 

 mulata (Primates) 



SJOSTRAND. F. S. M.D., Ph.D., Prof. — Dept. of Zool., Univ. of California. LOS ANGE- 

 LES, Calif. 90024, U.S.A. 



a Descriptive and biochemical molecular morphogenesis. 



b Morphogenesis of retinal receptor cells. 



c Morphogenesis of mitochondria, Golgi apparatus and other cytoplasmic membranes. 



139 



