On the Relations between the „Islets of Langerhans" etc. 97 



times observed two kinds of cells differing slightly though distinctly 

 li'om each other in their staining power (Confirmatory of Diamare, 

 Rennie, and others). 



12. Although the islets of Langerhans cannot be regarded as in 

 any sense a tissue sui generis, their abundant capillary supply and the 

 nature of their protoplasm suggest that they may have an internal 

 secretion, though we do not consider the evidence on this point to 

 be conclusive. 



Internationale Monatsschrift f. Anat. u. Phys. XXIV. 



