Briggs 17 Butler 



a. The problem of nuclear differentiation, investigated by means of trans- 

 plantation of embryonic cell nuclei into enucleated eggs. Rana (Anura) 

 (in collaboration with T. J. KING) 



BRIONES. H. M.D. — Inst, de Biol. ,Juan Noe". Univ. de Chile, Casilla 

 2988, SANTIAGO. Chile 

 (no data received on Nov. 1=', 1953) 



BROERS, C. J. M.Sc. — Anat.-Embryol. Lab. der Rijks Univ., Janskerkhof 

 3. UTRECHT, Holland 

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



BR0NDSTED, H. V. F.I.I.E., Dr Phil.. Prof. — Inst, for Aim. Zool.. 

 Universitetsparken 3, COPENHAGEN 0, Denmark 



a. Regeneration problems. Spongilla (Porifera) 



b. Regeneration problems. Planaria (Turbellaria) 



BROOKBANK, J. W. B.A., M.S. — Dept of Embryol., Div. of Biol., Cahf. 



Inst, of Technol., PASADENA 4, Cal., U.S.A. 

 a. Urease of developing embryos. Strongylocentrotus purpuratus (Echinoi- 



dea) 

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



CITY, Iowa, U.S.A. 



a. Hormones and sex differentiation. Ambystoma (Urodela) 



b. Respiratory metabolism of eggs. Rana pipiens (Anura) 



c. Natural causes of teratogenic development. (Mammalia) 



BUCHER. N. — Zool.-vergl. Anat. Inst., Naturwiss. Fak.. Univ. Ziirich, 



Kiinstlergasse 16. ZQRICH 6. Schweiz 



(no data received over some years) 

 BUNO, W. F.I.I.E.. B.S.. Ph.D.. Prof. — Dept de Histol. y Embriol.. Fac. 



de Med.. MONTEVIDEO. Urugay, S. America 



(no data received over some years) 

 BURDON-JONES, C. B.Sc, Ph.D. — Dept of Zool., Univ. Coll. of 



North Wales. BANGOR, Caernarvonshire, N. Wales (U.K.) 

 a. Embryology. (Protochordata) 

 BURNS, R. K. F.I.I.E., A.B., Ph.D. — Dept of Embryol., Carnegie Inst. 



of Washington, Wolfe and Madison Sts. BALTIMORE 5, Md. U.S.A. 



— Hon. Prof, of Zool., Dept of Biol., The Johns Hopkins Univ., BAL- 

 TIMORE 18, Md, U.S.A. 



a. The experimental control of sex differentiation in the embryo by means 

 of hormones. Didelphys virginiana (Marsupialia) 



b. A study of gonad modifications induced by hormones, and the reactions 

 of the gonoducts and urogenital sinus to hormones. Didelphys virginiana 

 (Marsupialia) 



BUSER— LAHAYE. Mrs J. Dr es Sci. — Lab. de Biol. Anim., Centre 

 d'Etudes Sup. Sci.. Avenue Biarnay, RABAT, Maroc 

 a. Regeneration des nageoirs. (Teleostei) 

 BUTLER E. G. Ph.D., Sc.D., Prof. — Dept of Biol., Princeton Univ., 

 PRINCETON. N.J.. U.S.A. 

 a. A study of the mechanics of the formation of the regeneration blastema. 

 The influence of nerves on blastema formation. Regression in nerveless 

 non-regenerating limbs. Ambystoma punctatum and Ambystoma opacum 

 (Urodela) 



