a. Histochemical investigation of early neural notochordal and related tis- 

 sues. Gallus gallus (Aves) 

 LEBLOND, C. P. M.D.. Ph.D., Prof. — Dept of Anat., McGill Univ.. 

 MONTREAL, Quebec, Canada 



a. Development of the thyroid gland. (Vertebrata) 



b. The development of bones and teeth as shown on radioautographs with 

 the help of radio-carbon-containing substances. (Vertebrata) 



LECAMP, M. — Lab. d'Evolution des Etres organises, Fac. des Sci. de 

 Paris, 105 Boulevard Raspail, PARIS Vie, France 



LEEUWENBERG, A. J. M. B.Sc. — Zool. Lab. der Rijks Univ., Jans- 

 kerkhof 3, UTRECHT, Holland 

 a. Influence of various kations on development. Limnaea stagnalis (Gas- 

 tropoda) (in collaboration with W. L. M. GEILENKIRCHEN and 

 Chr. P. RAVEN) 



LEFEBVRES— BOISSELOT, Mrs J. Dr es Sci. — Lab. d'Embryol., Fac. 

 de Med., 45 Rue des Sts Peres, PARIS Vie, France 



a. Teratogenese par carence en vitamines B. Mas rattus (Rodentia) 



b. Developpement anormal de I'encephale. Mus rattus (Rodentia) 



c. Developpement du bee de lievre. Mus rattus (Rodentia) 

 LEGHISSA, S. Ph.D. — Lab. di Istol. ed Embriol., 1st. di Anat. Comp., 



Via Belmeloro 8, BOLOGNA (103), Italia 



a. Study of egg-cortex. Fusion of blastomeres. (Ascidiae, Urochordata) 



b. Differentiation and morphology of nervous tissue. (Coelenterata) 



c. Comparative neurology. (Vertebrata) 



d. Effects of antimitotics on regeneration of peripheral nerves and on meta- 

 morphosis. Rana, Bufo (Anura) (in collaboration with P. PASQUINI) 



e. Regeneration of peripheric nerves. (Vertebrata) 



f. Action of vitamins (A, B group, C) on the histophysiology of endocrine 

 glands during metamorphosis. Rana (Anura) 



LEGRAND. J.-J. Dr es Sci., Prof. — Lab. de Zool.. Fac. des Sci.. POI- 

 TIERS, Vienne. France 



a. Determination et differenciation du sexe, castrations, greffes, correlations 

 humorales. Etude genetique de la monogenie. (Oniscoidea, Isopoda, 

 Crustacea) 



b. Developpement des coaptations. (Oniscoidea, Isopoda; Decapoda, Crus- 

 tacea), (Insecta) 



c. Etude de la croissance. (Oniscoidea, Isopoda, Crustacea) 



d. Modalites de la reproduction. Platyarthrus schoblii (Oniscoidea, Isopoda) 



e. Analyse biometrique des populations de deux especes soeurs dans le nord 

 et le midi de la France. Philoscia muscorum Scopoli and P. affinis Ver- 

 hoeff (Oniscoidea, Isopoda, Crustacea) 



LEHMAN, H. E. M.A., Ph.D. — Dept of Zool., Univ. of North Carolina. 

 CHAPEL HILL, N.C., U.S.A. 



a. Studies on the behaviour, differentiation and metabolism of pigment cells 

 as related to the establishment of specific pigment patterns of larvae and 

 adults. Ambystoma and Triturus (Urodela) 



b. Studies on the relation of external media and physical surfaces on the 

 migration and differentiation of tissues in vitro. Ambystoma and 

 Triturus (Urodela) 



c. Transplantation of blastula nuclei into enucleated, uncleaved eggs. Triton 



(Urodela) 



61 



