b Normal development of immunocompetence and factors affecting normal development 



(haemagglutinin and haemolysin tests). Xenopus laevis (Anuca) 

 RUCH, J. V. Dr.med., Dr.es Sci. — Inst. d'Embryol., Fac de Med., 11 rue Humann, 67 



STRASBOURG, France • 



a Action of dexamethasone in vivo and in vitro. Ocyctolagus cuniculus (Lago- 



morpha), Mus musculus (Rodentia) 

 b Epithelial-mesenchymal interactions, mitosis, and differentiation in teeth. Mus musculus 



(Rodentia) 

 RUDDLE, F. H. Ph.D., Prof. — Dept. of Biol., Kline Biol. Tower, Yale Univ., NEW 



HAVEN, Conn. 06520, U.S.A. • 



a Discrimination between genetic and epigenetic events in somatic cells in vitro by 



studying enzyme variants. Mus musculus (Rodentia) 

 b Genetic and epigenetic analysis utilizing somatic cell hybrids. 

 RUDNEVA, Miss T. B. — Inst, of Developm. Biol., Acad, of Sci. of the U.S.S.R., Vavilov St. 



26, MOSCOW 117133, U.S.S.R. 

 a Duration of mitotic phases in the period of synchronous cleavage. Xenopus laevis (Anura) 



(with T. A. DETTLAFF) 

 RUDNICK, Miss D. Ph.D. — Albertus Magnus Coll., 700 Prospect St., NEW HAVEN, 



Conn. 06511, U.S.A. • 



a Development of pharyngeal derivatives. Gallus domesticus (Aves) 

 RUfi, G. — Lab. de Biol. Cell., Fac. des Sci., B.P. 347, 51 REIMS, France 

 a Ultrastructure of nucleolus during oogenesis. Lineus ruber (Nemertea) 

 RUGH, R. Ph.D., Prof. (Emer.) — Radiol. Research Labs., Dept. of Radiol., Coll. of Phys. 



and Surg., Columbia Univ., 630 W. 168th St., NEW YORK, NY. 10032, U.S.A. 

 RUNNER, M. N. Ph.D., Prof. — Inst, for Developm. Biol., Univ. of Colorado, BOULDER, 



Colo. 80302, U.S.A. • 



RUNNSTROM, J. A. M. f M.D., Ph.D., Prof. — Wenner-Gren Inst., STOCKHOLM, 



Sweden 

 RUSAOUEN, Mrs. M. Dr.spec — Fac. de Med., Univ. d'Alger, ALGER. Algeria 

 RUSCH, H. P. M.D., Prof. — McArdle Lab. for Cancer Res., Univ. of Wisconsin, 450 N. 



Randall Ave., MADISON, Wis. 53706, U.S.A. 

 RUSSO-CAIA, S. Prof.Inc. — 1st. di Istol. ed Embriol., Univ. di Camerino, 62032 CAME- 



RINO, Italy 

 RUTH. R. F. Ph.D., Prof. — Dept. of Zool., Fac. of Sci., Univ. of Alberta, EDMONTON, 



Alta., Canada 

 RYABININA, Miss Z.A. Cand.biol.sci. — Inst, of Human Morphol, Acad, of Med. Sci. of 



the U.S.S.R., Baltiyskaya St. 8, MOSCOW 125315, U.S.S.R. 

 a Cytological characteristic of the regenerating liver. Rattus norvegicus, Mus musculus, 



Cavia porcellus and other spp. (Rodentia) 

 RYCZKOWSKI, M. Doc, Dr. — Dept. of Plant Physiol., Jagellonian Univ., Grodzka 53, 



KRAKOW, Poland 

 a Physico-chemical and physiological properties of the developing ovule and embryo. 1. 



Free amino acids in the environment of the embryo. 2. Free amino acids in the endosperm 



tissue and embryo during exponential phase of its growth. 3. Physico-chemical gradients 



in the ovule and embryo. 4. Respiration and oxygen tension of the ovule. (Monocotyledo- 



nae, Dicotyledonae, Gymnospermae) 

 RYFFEL, G. Lic.phil.nat. — Div. of Cell and Developm. Biol., Zool. Inst., Univ. of Bern, 



Sahlistr. 8, CH-3012 BERN, Switzerland 

 a Thyroxine and RNA synthesis in tadpole tissues. Xenopus laevis (Anura) (with R. 



WEBER and U. SCHIBLER) 

 RYLAND, J. S. Ph.D. — Dept. of Zool., Univ. Coll. of Swansea, Singleton Park, SWAN- 

 SEA, Glamorgan, Wales, U.K. 

 a Effect of environmental parameters on development. Pleuronectes platessa (Teleostei) 

 b Larval biology. (Bryozoa) 

 RZEHAK, K. Ph.D. — Dept. of Biol, and Embryol., Acad, of Med., ul. Kopernika 7, 



KRAKOW, Poland 

 a Influence of the nervous system upon regeneration. Triturus spec. (Urodela) 

 b Cytokinesis in eggs. Xenopus spec. (Anura) 

 SAAG, P. Th. M. van der M.Sc. — Hubrecht Lab. (Intern. Embryol. Inst.), Uppsalalaan 1, 



Universiteitscentrum "De Uithof", UTRECHT, Netherlands 

 SABBADIN, A. Dr., Prof. — 1st. di Biol. Anim., Univ. di Padova, Via Loredan 10, 35100 



PADOVA, Italy 

 a Differentiation of germ cells. Botryllus schlosseri (Ascidiacea) 

 SACARRAO, G da FONSECA Dr.Sc, Prof. — Fac. de Ciencias, Museu Bocage, LISBOA, 



Portugal 

 a Development of the epistellar body. Octopus spec, Argonauta spec. (Cephalopoda) 

 b Development of the statocyst. (Cephalopoda) 



c Blastokinesis. Tremoctopus violaceus, Octopus vulgaris (Cephalopoda) 

 SACHS, L. Prof. — Dept. of Genet., Weizman Inst, of Sci.. REHOVOTH, Israel • 



SACHS, T. Dr. — Dept. of Bot., The Hebrew Univ., JERUSALEM, Israel • 



155 



