330 
ILL TJSTRA TIONS. 
Plate III. 
CALCIUM-OXALATE CRYSTALS. 
Fig. 17. — Transverse section of rheum showing rosette aggregates 
of calcium oxalate in three cf the cells and starch 
grains in some of the others. 
Fig. 18. — Longitudinal section of scilla showing raphides. 
Fig. 19 — Longitudinal section of quillajashowing large monoclinic 
prisms and pyramids of calcium oxalate and also some 
starch grains. 
Fig. 20.— Transverse section of hyoscyamus leaf showing mono- 
clinic prisms of calcium oxalate, also a twin crystal. 
Fig. 21. — Longitudinal section of glycyrrhiza showing a crystal fiber, 
i. e., a row of superimposed cells, each containing 
polygonal monoclinic prisms of calcium oxalate, the 
crystal filling the cell. Adjoining the crystal fiber is 
a group of bast fibers and some cells containing starch. 
Fig. 22. — Transverse section of belladonna root showing one cell 
filled with cryptocrystalline crystals, the remaining 
cells containing starch. 
