b Determination of the DNA content in polyploid animals. Cerafrophrys dorsata, Odonto- 



phrynus cultripes, O. dorsata, Bufo paracnemis (Anuca) 

 LAVARACK, J. O. Ph.D. — School of Anat., Univ. of Melbourne. PARKVILLE 3052, 



Vict., Australia 

 a Histochemical investigation of cell interactions in the development of primary tissues. 



Gallus gallus (Aves) 

 LaVELLE, A. Ph.D., Prof. — Dept. of Anat., Coll. of Med., Univ. of Illinois. P.O. Box 



6998, CHICAGO, III. 60680, U.S.A. 

 a Cytodifferentiation of neurons. Cauia cobaya, Cricetus aurafus (Rodentia) 

 b Critical periods in neuronal maturation. Cricetus aurafus (Rodentia) 



c Total lipid and phospholipid changes during neuronal maturation. Cricetus auratus (Ro- 

 dentia) 

 d Immunochemical characteristics of developing brain. Cricetus aurafus (Rodentia) 

 e Immunochemical characteristics of developing lens tissue. Gallus gallus (Aves) 

 f Drug effects on developing nervous tissue. Amhystoma maculatum (Urodela) (in col- 

 laboration with Mrs. F. LaVELLE) 

 LAVELLE, C. L. B. Ph.D. — Dept. of Anat., Med. School, Univ. of Birmingham, Edgbaston. 



BIRMINGHAM 15, England 

 a Embryology of the dental cusp pattern. Raff us norvegicus (Rodentia), Homo sapiens 



(Primates) 

 LaVELLE (WILSON), Mrs. F. Ph.D. — Dept. of Anat., Coll. of Med.. Univ. of Illinois, 



P.O. Box 6998. CHICAGO, 111. 60680, U.S.A. 

 a Hormonal control of early sex differentiation. Cricetus auratus (Rodentia) 

 h Critical periods in neuronal differentiation. Cricetus auratus (Rodentia) 

 c Cytochemical differentiation of nervous tissue. Cricetus auratus (Rodentia) 

 d Drug effects on developing nervous tissue. Amby stoma maculatum (Urodela) (in col- 

 laboration with A. LaVELLE) 

 LAWRENCE, A. J. Ph.D. — Dept. of Cell Biol., Univ. of Glasgow, GLASGOW W.2, 



Scotland, U.K. 

 a Growth and differentiation of pancreas. Gallus domesficus. (Aves) 

 LAWRENCE, I. E., Jr. Ph.D., Prof. — Dept. of Biol., East Carolina Univ., Box 2577, 



GREENVILLE, N.C. 27834, U.S.A. 

 a Comb development. Gallus domesficus (Aves) 



1. A timed sequence of reciprocal comb and non-comb tissue grafts for tissue interactions. 



2. Development of the feathered crest fowl's comb primordium in an experimentally altered 

 position. 



3. Tissue reaggregation of comb and feather skin grafts. 



4. Histochemical patterns and hormonal influence on comb tissue development. 



5. Electrophoretic analysis of comb protein. 



b Comb and beak malformation resulting from removal of neural crest between stages 7-9. 



Gallus domesficus (Aves) 

 LAWRENCE, P. A. Ph.D. — Dept. of Genet., Univ. of Cambridge, Milton Road, CAM- 

 BRIDGE, England 

 a The development of bristles; in particular factors controlling their position and their 



initiation. Oncopeltus fasciafus (Heteroptera) 

 b Developmental genetics. Oncopeltus fasciafus (Heteroptera) 

 LAWSON, Miss K. A. Ph.D. — Hubrecht Lab. (Internat. Embryol. Inst.). Uppsalalaan 1. 



Universiteitscentrum "De Uithof", UTRECHT, Netherlands 

 a Morphogenesis and functional development of the parotid gland in vivo and i n 



vitro. Raftus raftus (Rodentia) 

 h Response of embryonic limb-bone rudiments to thyroid hormones in vitro. Gallus 



domesficus (Aves) 

 LAZARD (HAUBEN). Mrs. L. Dr.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, 1 1 Place M. Berthelot, PARIS Ve, France 

 a Limb regeneration, after X-irradiation. and grafts of various tissues and organs. Siredon 



mexicanum (Urodela) 

 h Late regulation in the embryonic limb. Gallus domesficus (Aves) 

 LEACH, C. M. Ph.D., Prof. — Dept. of Bot. and Plant Pathol, Oregon State Univ.. 



CORVALLIS. Ore. 97331. U.S.A. 

 a Light induction of reproduction in phytopathogenic species. (Fungi) 

 h Nature of sporogenic substances "P310" associated with spore formation. (Fungi) 

 c Interaction of light and temperature on the induction of reproduction. (Fungi) 

 LEBLOND. C. P. M.D.. Ph.D., Prof. — Dept. of Anat., McGill Univ., MONTREAL 2, 



Que.. Canada 

 a Development of the thyroid gland. (Vertebrafa) 

 h The development of bones and teeth as shown on radioautographs with the help of various 



labeled substances. (Vertebrafa) 

 LEDERMAN, R. J. M.D.. Ph.D. — Sect, on Exper. Embryol., Ophthalmol. Branch, Natl. 



Inst, of Neurol. Dis. and Stroke, Natl. Inst, of Health, BETHESDA. Md. 20014, U.S.A. 



102 



