CELLS WITH SPECIFIC FUNCTIONS. 



86 



inulin occur in the Artichoke, which extend through many cells. 

 Crystalloids of a proteid nature are also found at times in the 

 cell (c/. "Aleurone grains," Chap. x.). 



3. Cystoliths are structures in certain of the deeper epidermal 

 cells of the leaf of Ficus elastica (see Fig. 69). The main mass 



Fig. 70. — a, Laticiferous vessels in transverse section of Euphorbia 

 stem, b, Laticiferous VESSELS in a longitudinal section (SiijoAorfcia). 

 Note the branching and union of vessels by short side branches. 



of the cystolith is composed of amorphous carbonate of lime 

 [CaCOJ, which is deposited in the form of concentric layers or 

 small clusters upon an axial core of cellulose which projects into 



