254 MR. O. DARWIN ON THE ACTION OF CARBONATE 
Fig. 1. 
Longitudinal section of root of Cyclamen persicum after immersion in a solu- 
tion of carbonate of amınonia, and deposition in some of the cells of granules. 
a, part of vascular bundle; b, endoderm-cells ; c, parenchyma-cells ; d, exterior 
cells of the root, bearing root-hairs, e, with their tips cut off. Drawing made 
by aid of a camera, magnified 260 times, but here reduced to two thirds of 
original scale. 
Transverse section of another part of the same root, magnified as before, show- 
ing the exterior cells d, together with the root-hairs e, here containing granules. 
