PO V DEREP) DR VG, S'. 
311 
ments of ducts and parenchyma ; starch grains more 
or less spherical and from 2 to 10 ^ in diameter. 
B. WITHOUT STARCH. 
a. Calcium Oxalate Present. 
194. Scilla. — Raphides ; also isolated fragments of 
fibrovascular tissue. 
b. Calcium Oxalate Wanting-. 
195. Nux Vomica. — Grayish white ; odor slight ; taste 
intensely and persistently bitter ; epidermal cells 
modified to strongly lignified hairs; endosperm cells 
containing a fixed oil and aleurone grains, thick- 
walled, finely porous and giving a blue or violet 
color with potassium bichromate and sulphuric acid. 
Small, nearly spherical starch grains occur in the 
tissues of adhering fruit pulp. 
II. ABSENCE OF PLANT TISSUES. 
A. SOLUBLE IX WATER. 
196 Saccharum. — Characteristic crystals; soluble also 
in mounts of glycerin and glycerin -j- chloral ; taste 
sweet. 
B. INSOLUBLE IN WATER, 
a. Soluble in Alcohol. 
197. Camphora. — Liquefies in mounts of glycerin and 
chloral ; glycerin mounts show irregular masses. 
b. Insoluble in Alcohol. 
a REDDISH COLOR WITH SULPHURIC ACID AFTER 
SOME TIME. 
198. Saccharum Lactis.. — Small and large irregular- 
shaped crystals insoluble in mounts of glycerin or 
glycerin -f- chloral. 
