IIIb.7. 151 Illb. 8. 



J. Essai de filtration, „in vivo", de la substance inductrice 

 a l'aide de membranes de porosite connue, sur des 

 explantats de jeunes gastrulas. Axolotl (Urodeles) . 



Mile F. HUGON de SCOEUX 

 J. Analysis of the neural induction. Separation of archen- 

 teron roof and overlying ectoderm by semipermeable 

 membranes. Triturus taeniatus and Tr. alpestris. 



P. D. NIEUWKOOP 

 J. Radio-active tracer study of the metabolism of Illb. 7d. 

 amphibian eggs, with special reference to the organizer. 

 F. MOOG and E. L. WENGER 

 J. Regionale Induktion bei Amphibien. Triton. Ilia. 7. 



E. ROTMANN 

 J. Regional specificity in living and dead organisers. Tri- 

 ton alpestris. C. H. WADDINGTON 

 J. The chemical nature of the specific inductive substances 

 (isolated from liver and kidney of the guinea-pig). 

 Triton. Miss T. KUUSI 

 J. The specific action of heterogenous inductors. Triton. 



S. TOIVONEN 



Development of organ-systems. 



8. Skin, dermal formations (exo- skeleton, teeth, feathers), sense 

 organs and glands of skin (including mammae) and pigment 

 patterns. 



Formation of teeth. 



M. Factors governing dentin formation. Mus musculus. 



Miss J. J. P. ZAAIJER 

 Mammary gland. 



M. Prenatal growth and differentiation of the mammary 

 glands. Investigation of some cytochemical properties of 

 mammary gland rudiments (ribonucleic acid, alkaline 

 phosphatase, indophenoloxydase content) as compared 

 with the same in skin epidermis, hair follicles and 

 mesenchyme. Differentiation of mammary gland rudi- 

 ments in vitro. Mus musculus and Lepus cuniculus. 



B. I. BALINSKI 



M. Recherches sur de developpement embryonnaire de la 1. 8. 



glande mammaire de la Souris. Ula. 8. 



M. FRILLEY et A. RAYNAUD 

 Color pattern. 



J. Investigation of problems relating the behavior, diffe- Ilia. 8. 



rentiation and metabolism of Amphibian pigment cells, 

 and the analysis of factors relating to the establishment 

 of specific pigment patterns of larvae and adults. Species 

 of Amblystoma and Triturus. H. E. LEHMAN 



L. Role of hormones in differentiation of pigment patterns. Ilia. 8. 



Investigation of estrogen and thyroid hormone as mor- 

 phogenetic agents in pigment pattern differentiation. 



