PLATE 6 



EXPLANATION OF FIGURES 



60 and 61 Sections of the pancreas, showing the distribution of internal se- 

 creting cells which either are scattered solitarily or form smaller or larger groups. 

 The smallest black spot shows a solitary islet cell; cell groups or islets are delin- 

 eated in various sizes according to the number of cells constituting them. Fig- 

 ure 60, X180; figure 61, XIOO. 



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