b. Cellular differentiation (pigment cell; ectomesenchyme). 1. causal bio- 

 chemistry of cellular differentiation. 2. differentiation of cytoplasmic 

 fragments. Amby stoma maculatum (Shaw) (Urodela) 



c. Morphology and causal biochemistry of striated muscle differentiation. 

 Amby stoma maculatum (Shaw) (Urodela) 



d. Continuous flow curtain electrophoresis of molecular constituents of 

 specific embryonic anlagen and cell types. Fraction recovery and tissue 

 culture of embryonic cells in the presence of selected fractions. Amby- 

 stoma maculatum (Shaw) (Urodela) 



WILENS, Miss S. W. A.B. — Osborn Zool. Lab., Yale Univ., NEW 

 HAVEN 11, Conn., U.S.A. 

 a. The movements of the endoderm in early stages studied with the use 

 of vital dyes. (Urodela) 

 WILLIAMS, J. B.Sc, M.B., Ch.B. — Dept of Biochemistry. Med. School 

 Univ. of Cambridge, CAMBRIDGE, England 

 a. Chemistry of yolk proteins. Gallus spec. (Aves) 

 WILLIAMS, R. G. A.B., M.S., M.D., Prof. — Dept of Anat., School of 



Med., Univ. of Pennsylvania, PHILADELPHIA 4, Pa, U.S.A. 

 WILLIAMS. S. C. B.S., Ph.D. — Dept of Anat.. School of Med., Univ. of 



Pennsylvania, PHILADELPHIA 4, Pa, U.S.A. 

 WILLIER, B. H. B.S., Ph.D., Sc.D.. F.I.I.E., Prof., — Dept of Biol.. The 

 Johns Hopkins Univ., Charles and 34th Sts. BALTIMORE 18, Md. 

 U.S.A. 

 a. Re-examination of the interactions of cortical and chromaffin cells in the 



development of the adrenal gland and its secretory activity. (Aves) 

 h. Analysis of the nature of mechanisms operating in time and space in the 



development of rhythmic pigmentation design. (Aves) 

 c. Formulation of principles and concepts appertaining to the development 

 of hormonal miheu as a means of dynamic integration of the growing 

 embryo. 

 WILSON, J. G. B.A., M.A., Ph.D. — Dept of Anat., Coll. of Med., Univ. 

 of Florida. GAINESVILLE. Florida. U.S.A. 

 a. Mechanism of the teratogenic action of trypan blue. Teratogenic action 

 of azo dyes (survey). Rattus norvegicus albinus (Rodentia) 

 WILSON, J. W. Ph.D., Prof. — Arnold Biol. Lab., Brown Univ., PROVI- 

 DENCE 12, R.I., U.S.A. 

 a. A study of mitotic activity and other cytological phenomena in liver 

 regeneration. (Vertebrata) 

 WILT, F. H. A.B. — Dept of Embryol., Carnegie Inst, of Washington. 

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

 a. An analysis of the mechanism of conversion of porphyropsin to rhodop- 

 sin in the retina during metamorphosis, with the use of biochemical 

 methods. Rana catesbiana (Anura) 

 h. Cell and organ specific effects of structural analogues of pyridine 

 nucleotide coenzymes and their precursors, tested in vitro. Gallus 

 gallus (Aves) 

 c. The role of induced enzyme formation in development, tested by attempt- 

 ing to induce galactokinase in presumptive embryonic muscle, in vitro. 

 Gallus gallus (Aves) 

 WIMSATT. W. A. A.B.. Ph.D., M.I.I.E., Prof. — Dept of Zool., Cornell 

 Univ.. ITHACA. N.Y.. U.S.A. 



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