• LENDER. Th. Prof. — Lab. de Biol. Anim., S.P.C.N.. Univ. de Paris, Fac. dcs Sci. d'Or- 



say, 91-ORSAY (Essonne). France 

 a Problemes de la regeneration: substances inductrices et inhibitrices. (Planariidae, Tiirbcl- 



laria) 

 b Etude au microscope elcctronique de la regeneration (en particulier des neoblastes). 



Dugesia gonocephala (Turbellaria) 

 c Neurosecretion. (Planariidae, Turbellaria) 

 d Regeneration. Asterina gibbosa (Asteroidca. Echinodermata) 

 e Culture in vitro d'organes larvaires. Galleria spec. ( Lepidoptera) , Periplaneta spec. 



('OrC/2opfera; 

 f Culture in v i t r o de gonades femelles. Tenebrio molitor (Coleoptera) 

 LENICQUE, P. M. Ph.D. — Wenner-Gren's Inst, for exper. Biol., Norrtullsgatan 16, 



STOCKHOLM Va.. Sweden 

 a Natural inhibitory and promotory agents during regeneration. (Hydroidea) 

 b Dynamics of cells during regeneration. (Hydroidea) 

 LENSKY. Y. Ph.D. — Dept. of Entomol., Fac. of Agriculture, Hebrew Univ. of Jerusalem, 



P.O.B. 12, REHOVOTH, Israel 

 a Changes occurring in proteins of haemolymph during metamorphosis. Apis mellifica var. 



ligustica (Hymenoptera) 

 b Separation, characterization and identification of proteins of haemolymph, in three castes 



and in two races. Apis mellifica var. ligustica (Hymenoptera) 

 c Distribution of blood antigens in fluid compartments and tissues of developing and adult 



animals, using immuno-chemical and biochemical analyses. Apis mellifica var. ligustica 



(Hymenoptera) 

 d Distribution of blood antigens in fluid compartments and tissues in diapausing pupae and 



developing adults. Hyalophota cecropia (Lepidoptera) 

 e Motility and reversible inactivation of spermatozoa; long-term storage conditions of 



spermatozoa in queen spermatheca. Apis mellifica var. ligustica (Hymenoptera) 

 LENZ, W. M.D., Prof. — Inst, fiir Humangenetik der Univ., Vesaliusweg 12/14, 44 MON- 



STER/Westf., Deutsche Bundesrepublik 

 a Analysis of thalidomide embryopathy in relation to time of intake. Homo sapiens (Prima- 

 tes) 

 b Analysis of malformations associated with maternal diabetes. Homo sapiens (Primates) 

 LEONARD, A. Ph.D. — Lab. de Genet., Dept. de Radiobiol., Centre d'Etude de I'Energie 



Nucleaire, MOL, Belgium 

 a Study of chromosome aberrations induced by X-irradiation in u t e r o. {Mammalia) 

 • LEONE, V. M.D. — Catt. di Embriol. e Morfol. Sper., Univ. di Milano, Via Celoria 10, 



MILANO, Italia 

 LEONIENI, J. Dr. — Dept. of Histol. and Embryol., Acad, of Med., ul.Narutowicza 60, 



eODZ, Poland 

 a Comparative histological, histochemical, and electron microscopical studies on the develop- 

 ment, structure, and function of the subcommissural organ. (Mammalia), Homo sapiens 



(Primates) 

 LEPORI, N. G. Prof. — 1st. di Biol, e Zool. gener., Univ. di Sassari, SASSARI, Sardegna, 



Italia 

 a Research on the origin of the asymmetry of the female gonad (blastoderm in vitro). 



(Aves) 

 b Research on the origin of asymmetrical heart development (blastoderm in vitro). 



Gallus spec. Anas spec. (Aves) 

 c Research on the inductor of the uro-genital organs. Gallus spec. (Aves), Rana spec, 



Triturus spec. (Amphibia) 

 LE ROUX, J. M. W. Dr.med.vet. — Dept. of Anat., Fac. of Veter. Sci., Univ. of Pretoria, 



P.O. ONDERSTEPOORT, South Africa 

 a Development of the cranial venous system. (Ruminantia, Ariiodactyla) 

 LESH, Miss G. E. Ph.D. — Dept. of Biol. Sci., State Univ. of New York at Albany, AL- 

 BANY, N.Y. 12203, U.S.A. 

 a Investigations of neoblast movement and cell differentiation. (Hydrozoa, Coelenterata) 

 LESSEPS, R. J., S.J. Ph.D. — Dept. of Biological Sci., Loyola Univ., NEW ORLEANS, La. 



70118, U.S.A. 

 a Ultrastructure of cell surface (embryonic liver, heart, neural retina, limb bud). Gallus 



domesticus (Aves) 

 LEUSSINK, J. A. M.Sc. — Hubrecht Lab. (Internat. Embryol. Inst.), Uppsalalaan I, Univer- 



siteitscentrum "De Uithof", UTRECHT, Netherlands 

 a Distribution of inductive capacity in the archenteron-roof and in the overlying neural 



plate (explantation experiments). (Urodela) 

 LEVAK (SVAJGER), Mrs. B. D.Sc — Inst, of Biol., Fac. of Med., ZAGREB, Salata, Yugo- 

 slavia 

 a Investigation of early differentiation; transplantation, in vitro culture. Ratfus nocve- 



gicus (Rodentia) (in collaboration with N. SKREB and A. SVAJGER) 



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