130 PLANT ANATOMY. 
system; these occur separately or in groups, particularly in the 
root formations of monocotyledons, very notably in Bulbus 
Seille (Fig. 56), and in Radix Sarsaparille (Fig. 123'),but also 
in stems and leaves, as, for instance, in the Aloé (Fig. 63, cr). 
The undeveloped, crystalline, powdery oxalate, which is met 
with, for instance, in the Cinchona barks, in Stipes Dulcamare, 
and in Radix Belladonne, should probably also be considered 
here. Such deposits become better recognizable when the sec- 
tions, freed as much as possible from air, are observed in pola- 
rized light. More distinctly and variously developed are the 
Fie. 57, Fia. 58. 
Fie. 57,—Fundamental form of the monoclinic crystals of calcium oxalate, with only 
one molecule of water. This form, hendyohedron, resembles in appearance a rhom- 
Dohedron of the hexagonal system, and is therefore often designated as ‘‘ rhombohe- 
-dron-like oxalate.” 
Fic. 58.—a, Hendyohedron ; b and c, crystals of the monoclinic system in Cortex 
Frangul, derived by truncation from the fundamental form (from Dippel). 
crystals which in form approach that of the hendyohedron 
(Fig. 57), which may be regarded as the fundamental form of 
the monoclinic salt. Very handsome and very regularly devel- 
oped crystals of this kind occur in Radiz Calumba, Folia 
Hyoscyami and Cortex Frangule (Fig. 58), and particularly 
also, in a considerable variety of forms, in the non-official 
bark of Liqguidambar orientalis Miller, which yields the Styrax 
Uiquidus. In Cortez Aurantiorum the crystals are likewise 
quite large and are inclined to be sharpened ina striking manner. 
- " Compare also Schleiden, Archiv der Pharm., 1847, Plate I., Fig. 5. 
