Tsch 89 Ty 



TSCHUMI, P. — Abt. fur Zoophysiol., Zool. Inst, der Univ., Sahlistr. 8, 

 BERN, Schweiz. 

 a. Chemische Beeinflussung der Extremitatenbildung von Xenopus. (Am- 

 phibia) 



TSENG, Miss M.P. B.S. — Dept of Zool., Coll. of Sci., Nat. Univ. of 

 Peking, Ching Shan Tung Chieh, PEIPING, China. 



a. Localization of the factors which cause situs inversus in tadpoles by 

 defect and inversion experiments. (Removal and inversion of different 

 parts of neural plate and chorda-mesoderm, or lateral plate). Rana 

 nigromaculata (Amphibia) 



b. Intestinal canal can only be formed in the whole embryo; in the extirpated 

 entoderm no canal formation ever occurs. By combination of entoderm 

 fragments with different parts of mesoderm in explants the formation 

 of the intestinal canal may be studied. Rana nigromaculata (Amphibia) 



c. Determination of: how entoderm regulates its lost parts; when entoderm 

 loses its power of regulation; and whether the regulation power is lost 

 gradually or suddenly at a certain stage. Moreover the question: whether 

 the entoderm at the neural plate stage still retains its power of regulation 

 when different portions of entoderm are removed. Afterwards earlier 

 stages will be examined in similar way. Rana nigromaculata (Amphibia) 



TUFT P. H. M.A., Ph.D. — Dept of Zool., Univ. of Edinburgh, West 

 Mains Rd, EDINBURGH 9, Scotland, 

 a. Respiratory metabolism of developing Insect eggs. Rhodnius prolixus, 

 Locustana pardalina and Calliphora 



TUNG, T. C. Dr, Prof. — Dept of Zool., Univ. of Shantung, TSINGTAO, 

 China. (no data received) 



TWEEDELL, K. S. — Dept of Zool., Univ. of Illinois, URBANA, 111., 

 U.S.A. 

 a. Varying growth periods of the Lucke' carcinoma in different species 

 of Rana. (Amphibia) 



TWITTY, V. C. Dr, Prof. — Dept of Biol. Sci., Stanford Univ., STAN- 

 FORD, Cal.. U.S.A. 



a. The differentiation of macrophages into melanophores following their 

 ingestion of pigmentary debris released by degeneration of preexisting 

 melanophores. (Amphibians) (in collaboration with M. C. NIU) 



b. The origin of chromatophores of the salamander tail. (Amphibians) 

 (in collaboration with M. C. NIU) 



c. Factors influencing pigment differentiation in amphibian melanoblasts. 

 (in collaboration with M. C. NIU) 



d. The transformation of differentiated xanthophores into typical melano- 

 phores. (Amphibians) (in collaboration with M. C. NIU) 



e. The differentiation of single isolated gastrula ectoderm cells cultured 

 under special conditions in vitro. (Amphibians) (in collaboration with 

 M. C. NIU) 



f. The migratory behaviour of single neural crest melanoblasts isolated in 

 capillary tubes of extremely small bore. (Amphibians) (in collaboration 

 with M. C. NIU) 



TYLER, A. Ph.D., Prof. — Dept of Embryol., Div. of Biol., California Inst, 

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



a. Physiology of fertilization, (various species of Echinoids) 



b. Physiology of early development, (various species of Echinoids and 

 various species of Polychaets) 



