Bretscher 1 7 Brune 



b. Development of the leg of the domestic fowl; influence of colchicine. 



c. Development of the leg of the domestic fowl: influence of the epidermis. 



d. The development of skeleton and muscles of the pelvic-girdle and hind 

 limbs of Xenopus laevis. (Anura, Amphibia) (Normal Table) 



BRETSCHNEIDER. L. H. — Zool. Lab.. State Univ. of Utrecht, Fac. of 



Sci., Janskerkhof 3, Utrecht, Holland, 

 a. Electron microscopical investigation on differentiation, insemination, 



growth and differentiation of the egg of Limnaea stagnalis. (Gastropoda) 

 BRIEN, P. Dr. Prof. — Lab. de Zool., Fac. des Sci., Inst, de Zool. Torley- 



Rousseau, Univ. libre de Bruxelles, 50, Av. F. D. Roosevelt, BRUXEL- 



LES, Belgique. 



a. Reproduction asexuee. Regeneration. Etude des facteurs conditionnant 

 l'apparition de la sexualite. Formation des cellules sexuelles. Develop- 

 pement embryonnaire. (Tuniciers, Eponges, Coelenteres et Oligochetes) 

 (partiellement en collaboration avec Madame M. H. HERLANT) 



b. Biologie des Hydro'ides. Bourgeonnement, croissance, sexualite (Hydra) 



c. Etudes histologiques du bourgeonnement. Etudes histologiques de la 

 gametogenese. Experiences par marques colores. Regeneration de la 

 croissance. Facteurs exterieurs conditionnant le bourgeonnement et la 

 sexualite. Hydra (Hydro'ides) 



BRIGGS, R. W. Ph.D. — Lankenau Hosp. Res. Inst, and Inst, for Cancer 

 Res., Burholme Ave, Fox Chase. PHILADELPHIA 11, Pa. U.S.A. 



a. Cytochemical and transplantation study of cells from partial blastulae 

 lacking functional chromosomes. Rana (Amphibia) (in collaboration with 

 E. U. GREEN and T. KING) 



b. Study of the reaction between the living sperm nucleus and toluidine 

 blue. Rana (Amphibia) 



c. Development of gynogenetic diploids. Rana (Amphibia) 



BROEK, Miss E. v. d. — Zool. Lab. der Rijks Univ., Janskerkhof 3, 

 UTRECHT. Holland, 

 a. Analysis of lithium action. Limnaea stagnalis (Gastropoda) (in colla- 

 boration with G. A. van ARKEL, Mrs A. S. DUYKER— de BEER, 

 Miss W. H. T. van HEESCH, J. C. N. KOK, J. W. KUIPER, Miss 

 R. P. van LOO, G. D. NIJENHUIS, Miss J. E. H. SMIT and W. L. 

 van UTRECHT). 



BROERS, C. J. Biol, drs — Anat.-Embryol. Lab. der Rijks-Univ., Janskerk- 

 hof 3, UTRECHT, Holland, 

 a. The development of the tympanic region and skull. (Mammalia) 



BR0NDSTED, H. V. Dr Phil., Prof. — Inst, for Aim. Zool., Universitets- 

 parken 3, COPENHAGEN 0, Denmark. 



a. Regeneration. (Planarians and Sponges) 



b. Mammalian embryology (first stages). 



BRUINS, G. Drs Vet. — Veter.-Anat. Inst.. Biltstr. 172, UTRECHT, 



Holland, 

 a. Development of genital tract and gonads in domestic animals. (Birds 



and Mammals) (in collaboration with G. KREDIET) 

 BRUNER, Miss J. A., Ph.D. — Zool. Dept, State Univ. of Iowa, IOWA 



CITY, Iowa. U.S.A. 



a. Gonadotropic hormones in mother and fetus at various stages of preg- 

 nancy. Man (Mammals) 



b. Hormones and sex differentiation. Amblystoma (Amphibians) 



