Photograph by O. F. Cook 



LEAVES, FLOWERS, AND MATURE BERRIES OF THE COCA PLANT 



All the parts are shown in natural size. The leaves, which are the source of the cocaine 

 drug, are very peculiar. The two surfaces are quite unlike — the upper, deep green, smooth, 

 and velvety; the lower, light green, with a band of paler color on each side of the midrib,, 

 inclosed by fine ridges. The young leaves are rolled in from the margins, so that only this 

 median band of the lower surface is exposed at first. 



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