ii6 INTERNAL SECRETIONS 



different granules of protein nature detected afterwards by 

 other investigators (see e.g. Whitehead, 1912 b). The secreting 

 granules characteristic of glandular cells and chondriosoma can 

 be seen in the interstitial cells {Wagner, 1923) {Fig. 56). Dr. 

 Wagner finds that, when a common connective tissue cell is in 

 process of transformation into an interstitial cell, the protoplasm 



Fig. 55. — Section through testicle of adult cat, stained 

 with Sudan. — Complete spermatogenesis; great 

 quantity of interstitial cells full of fat. — Prepar. 

 Wagner; design, Lehbert. 



is characterised by an increase in size of the secreting granules 

 and the chondriosoma which augments the size of the whole 

 cell. Wagner has also made some observations which tend to 

 show that, so far as fat appears in an interstitial cell, this fat 

 is very specially localised (see Fig. 56). If it is permissible to 

 draw conclusions as to function from histological appearance, 

 one must presume that the interstitial cells are glandular. 



