Wr 99 Yn 



WRBA, H. Dr Med. — Inst, fiir exp. Krebsforschung der Univ. Heidelberg, 



Vossstrasse 3, HEIDELBERG, Deutschland 

 a. Untersuchungen zur Frage der Differenzierung insbesondere des Zen- 



tralnervensystems und der Herzanlage in vivo und in vitro. (Ro^ 



dentia) 

 YAMADA, T. D.Sc. (Rigakuhakushi), Prof. — Biol. Inst.. Fac. of Sci., 



Nagoya Univ., Chigusa-Ku. NAGOYA, Japan 



a. Double potential theory of early ontogenesis, its application to the 

 regionality of the organizer action. (Vertebrata) 



b. Regional induction by some fractions of adult tissue tested on the 

 isolated ectoderm. Tritutus pyrrhogaster (Urodela) 



YAMAMOTO. K. Rigakushi (M.S.), Asst Prof. — Akkeshi Marine Biol. 

 Stat., Hokkaido Univ., AKKESHI, Japan (attached to the Sci. Fac. of 

 Hokkaido Univ.) (no data received on Nov. 1^'. 1953) 



YAMAMOTO, T. Dr Sc, Prof. — Biol. Inst., Fac. of Sci., Nagoya Univ., 

 Chigusa-Ku, NAGOYA, Japan 



a. On the mechanism of fertilization and activation. Oryzias latipes 

 (Teleostei) 



b. Experimental analysis of the development of sexual characters. Oryzias 

 latipes (Teleostei) leostei) 



.c. Experimental sex-reversal in the genetic males. Oryzias latipes (Te- 

 d. Melanin formation in color phenotypes. Oryzias latipes (Teleostei) (in 

 collaboration with T. HISHIDA) 



YANAGIMACHI, R. Rigakushi (M.S.) — Zool. Inst., Fac. of Sci., Hok- 

 kaido Univ., North 8. West 5. SAPPORO, Japan 

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



YAO, T. Ph.D. — Lab. of Developm. Physiol., Inst, for Exper. Biol., Acad. 

 Sinica, 865 Chang Ning Rd, SHANGHAI, China 

 (no data received over some years) 



YASHIKA, K. — Lab. of Embryol. and Exper. Morphol., Zool. Inst., Dept 

 of Sci., Kyoto Univ., KYOTO, Japan 

 a. Hormonal mechanism of metamorphosis. Bombyx mod, Luehdorfia japo- 

 nica (Lepidoptera) and Lucillia (Diptera) 



YATES, Miss H. B. B.Sc. (St Andrews) — Inst, of Animal Genet., Univ. 

 Dept of Genet., King's Buildings, West Mains Rd, EDINBURGH 9, 

 Scotland (U.K.) 

 a. Use of radioactive isotopes for tracing the movement of labelled sub- 

 stances into and within embryos. (Amphibia) (in collaboration with 

 C. H. WADDINGTON and J. DAINTY) 



YNTEMA, C. L. F.I.I.E., Ph.D., Prof. — Dept of Anat., School of NTed., 

 State Univ. of New York. SYRACUSE 10, N.Y., U.S.A. 



a. Induction and differentiation of ear ectoderm. Ambystoma punctatum 

 (Urodela) 



b. Regeneration of aneural limbs. Ambystoma punctatum (Urodela) 



c. Development of autonomic nervous system. Gallus domesticus (Aves) 

 (in collaboration with W. S. HAMMOND) 



d. Effect of sulfa drugs on the embryo. Mus musculus (Rodentia) (in 

 collaboration with W. S. HAMMOND) 



e. Development of the visceral skeleton. Gallus domesticus (Aves) (in 

 collaboration with W. S. HAMMOND) 



