STONE-CELLS. 201 
doubtful. Occasionally the stone-cells contain crystals (Fig. 
102) or other substances. 
Fic. 118,—Transverse section through the sieve portion of Cortex Coto. st, staff- 
shaped bast-cells; m, partially sclerotized medullary rays; s, bundles of collapsed _sieve- 
tubes (Moeller). ; 
