Ilia. 8. 134 Ilia. 9. 



Development of organ-systems. 



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

 organs and glands of skin (including mammae) and pigment 

 patterns. 



Formation of teeth. 

 M. Tooth development. Rat. J. H. M. G. van DETH 



M. Role of the odontoblasts in the formation of secondary 



dentin. Mus musculus. Miss J. J. P. ZAAIJER 



Feather and hair development. 

 L. Study of the determination of details of the feather Ilk. 2. 



structure, including both regional characteristics and 



hereditary variations. Gallus domesticus. J. M. CAIRNS 

 L. Embryological analysis of feather-growth. The problems I. 8. 



of the "afterschaft" and of ,,diastataxy". Ratites and II. 8. 



Carinatae. H. STEINER 



Pigment pattern. 

 L. The mechanisms whereby feather colour patterns are Illb. 8. 



produced. IIIc. 2. 



a) Interaction of pigment cells of known genotype 

 with feather germ ("the builder" of the structural 

 parts of the feather); 



b) Factors regulating migration of pigment cells and 

 their growth (multiplication) and differentiation 

 (synthesis of specific melanin granules); 



c) The rdle that sex and other hormones play in 

 modifying the expression of pigment cells in color 

 feather formation. 



(Utilizing various techniques such as grafting and 

 in vitro cultures). 

 Gallus domesticus (various breeds and varieties). 

 B. H. WILLIER, Miss M. E. RAWLES and students 

 L. The role that sex and other hormones play in modifying Illb. 8. 



the expression of pigment cells in color feather for- 

 mation. Utilizing various techn. such as grafting and 

 in vitro cultures, the various phases of the over-all 

 problem are being investigated. Chick. 



Miss M. E. RAWLES and B. H. WILLIER 



M. The nature of the processes involved in formation of 



pigment of the hair and skin of mammals, (mouse and 



rat). Miss M. E. RAWLES 



9. Nervous system, ganglia, nerves and enveloping membranes. 



General subjects. 

 H. The infundibular organ of Amphioxus. J. BOEKE 1.9. 



J. Neuro-embryology. Bufo atenarum. W. A. FERREIRA 1. 9. 



J. Differentiation in the nervous system. Amblystoma. 



J. H. PERRY 



