Toro 104 Ts 



Thymectomy and the calcium content of the bird's egg. Illb. 2c. f. L. 

 Influence of yolk on the germlayers. Birds. Illb. lc. L. 



TOWNES, Ph. L. Selective cellular adhesion in embryonic germ 

 layers. Urodeles and Anurans. Illb. lc. J. 



TRACY, H. C. The development of all systems of the toadfish in 

 relationship to behavior. Ilia. 2a. I. 



(in collaboration with J. WINBLAD and Th. BATTY) 



TRAMPUSCH, H. A. L. Experiments on the head-organizer by means 

 of X-rays and a new micro-surgical device. Amphibians. 



Ilia. 7. d. J. 



Experiments on secondary inductors, mainly on sense organs. Am- 

 phibians. Ilia. 10. J. 



Experiments on the gradient-concept. Hydroidea. IV. 1. B. 



TRIBE, Miss M. Development of the trabeculae and parachordals in 



the Lamprey. (in collaboration with A. FISK) I. 11. 1. 



TRINKAUS, J. P. Mechanism of gastrulation in teleost eggs. The 

 nature of the surface gel layer of the egg and its possible role in 

 the cell movements (particularly epiboly) characteristic of teleost 

 gastrulation. Extensive utilization of the methods of marking, woun- 

 ding, transplantation. Fundulus heteroclitus (Osteichthyes). 



Ilia. 6. I. 



Role of hormones in differentiation of pigment patterns. Investiga- 

 tion of estrogen and thyroid hormone as morphogenetic agents in 

 pigment pattern differentiation. The particular emphasis has been 

 on the response of melanoblasts to these hormones and the role 

 of epidermis in conditioning this response. Gallus domesticus. 



Illb. 8. f. L. 



TROMBETTA, P. Serology of embryo. Birds. Illb. 15. L. 



TRUSLOVE, G. M. The study of the normal development of the 

 lateral lines in an amphibian with observations on their regenerative 

 capacity. Xenopus laevis (Anura). I. 8. }. 



TSCHUMI, P. Chemische Beeinflussung der Extremitatenbildung von 

 Xenopus. Ilia. 2b. e. }. 



TSENG, Miss M. P. Localization of the factors which cause situs in- 

 versus in tadpoles by defect and inversion experiments. (Removal 

 and inversion of different parts of neural plate and chorda-meso- 

 derm, or chorda-mesoderm, or lateral plate). Rana nigtomaculata. 



Ilia. 13. J. 



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 nigro* 

 maculata. Ilia. 13. J. 



Determination of; how entoderm regulates its lost parts; when ento- 

 derm 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 nigtomaculata. Ilia. lc. J. 



