Brachet o/ Ca 



Cytocherrical observations on the first stages of Amphibia, (various 



species). Mb. 2c. c. J. 



(in collaboration with J. PASTEELS) 



BRETSCHER, A. (data not yet received). 



BRETSCHNEIDER, L. H. Electron microscopical investigation on 

 differentiation: Insemination, growth and differentiation of the egg 

 of Limnaea. I. 2a. E. 



BRIEN. P. Reproduction asexuee. Regeneration. Etudes des facteurs 

 conditionnant l'apparition de la sexualite. Formation des cellules 

 sexuelles. Developpement embryonnaire. Tuniciers, Eponges, Coe- 

 lenteres et Oligochetes. Ilia. 2a. EV.(A. C.GetH). 



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



BRINI,, A. Origine des cellules pigmentaires de la choroide chez les 

 vertebres superieurs. Ilia. 10. HV. 



BROERS, C. J. The development of tympanic region and skull of 

 Tarsius spectrum. I. 10. M. 



BRPNDSTED, H. V. Regeneration. Triclads(?). IV. 2. C. 



Mammalian embryology (first stages). I. 2a. M. 



BRUNETTI, G. M. Regeneration de la queue des Reptiles. IV. 4. K. 

 BUCCIANTE, L. (data not yet received). 



BUCHER, N. Influence of radiation and chemicals on Drosophila 

 melanogaster (Insecta) -ovaries. Mb. 17. e. D. 



BUCHTOWNA, Miss A. Development of ribs. Salmonidae and Cy- 

 prinodontidae (Teleostei) and Salamandra (Urodela). II. ll.LV. 



BUNO, W. Normal table of the development of Bufo arenarum Hensen. 



I. 2a. J. 



Role of the Hensen knot. Induction in birds. Ma. 7. L. 



Prospective areas in the chick blastoderm. Ma. 2b**. HV. 



(in collaboration with C. M. FRANCHI) 



Enzymes in the development of the embryo. Chick and pig. 



Mb. 2c. c. HV. 

 (in collaboration with R. E. GONZALEZ MARINO and Miss 

 J. ALVAREZ GUTIERREZ) 



BURNS, R. K. The experimental control of sex differentiation in the 

 embryo by means of hormones. Didelphys virginiana (Marsupialia) . 



Ma. 17. M. 



BURR, H. S. (data not yet received). 



BUTLER, E. G. A study of the mechanics of the formation of the 

 regeneration blastema. The influence of nerves on blastema for- 

 mation. Regression in nerveless non-regenerating limbs. Amblystoma 

 punctatum and Ambl. opacum. IV. 2. J. 



BUTLER, E. G. Blastema formation and regeneration in urodele limbs 

 in which proximo-distal polarity has been reversed. Amblystoma 

 punctatum and Ambl. opacum. IV. 4. J. 



CAIRNS, J. M. Study of the determination of details of feather struc- 

 ture, including both regional characteristics and hereditary varia- 

 tions. Gallus domesticus. Ma. 8. L. 



Study of the differentiation of the limb structure. Gallus domes~ 



ticus. Ma. 2b. L. 



