310 
PHARMACOGNOS)'. 
180. Arrow Root Starch (Bermuda). 
181. Potato Starch. 
182. Corn Starch. 
183. Rice Starch. 
184. Wheat Starch. — Does not agglutinate on mixing 
with water, distinction from wheat flour. 
b. Altered and Unaltered Stare li Grains Present. 
185. Dextrin. — Sticky mass with water; few unal- 
tered starch grains also present. 
c. Plant Tissues in Addition to Starch Grains. 
The former remain upon treatment with hot 
glycerin. 
a. DO NOT READILY DISSOLVE OR SWELL IN COLD 
WATER. 
188. Corn Meal. — More starch and oil and little hull, 
as compared to cornbran. 
187. Corn Bran. — Less starch and oil and more hull, 
as compared to cornmeal. 
188. Wheat Flour. — Agglutinates with water, distinc- 
tion from wheat starch ; little tissue of wheat grain. 
189. Wheat Middlings. — Starch and numerous frag- 
ments of tissues of wheat. 
190. Nux Vomica. — (See No. 195.) 
191. Orris Root. — Characteristic starch grains 15 to 
30 fj. in diameter; scalariform ducts 25 ^ in diameter; 
no cork. 
191a. Quillaja. — (See No. 169). 
SOLUBLE IN OR SWELLING IN COLD WATER TO 
FORM A STICKY MASS. 
192. Acacia (White). — Soon affected by water; few 
plant tissues present. 
193. Tragacantha. — Slowly affected by water; frag- 
