CELL-CONTENTS AND FORMS OF CELLS. 141 



FIG. 87. Successive stages in the development of starch grains, in Pellionia Daveauana 

 (A to N); and in the fruits of the potato plant, Solatium tuberosum (P to R). In A, two 

 plastids with a number of small starch grains; B, a plastid in which a single starch grain is 

 differentiated; C to L, successive stages of the development of a single grain, the plastid 

 body being shown on the surface (p); M, N, the development of several 2-compound starch 

 grains; P to R, the development of additional layers at right angles to the original grain. 

 After Dippel in "Das Mikroskop." 



usually found in the interior of the chloroplastid, but may attain 

 such a size that they burst through the boundary wall of the 

 plastid, which latter in the final stage of the growth of the starch 

 grain forms a crescent-shaped disk attached to one end of the 



