MICROSCOPY OF THE COMMON STARCHES. 65 
sugars. It may often be found as an adulterant in the 
more costly starches, and in spices and other foods. 
Its grain is easily recognized, being of medium size, 
Fic. 28.—THE ComMMONER STARCHES. (Redrawn, after Schimper.) 
240 diameters. 
1. Wheat-starch. 4. Tapioca-starch. 
2. Corn-starch. 5. Potato-starch. 
3. Rice-starch. 6. Bean-starch. 
.oI-.02 mm., and of a characteristic polyhedral form, its 
angularity at once distinguishing it from the starches of 
wheat and potato. Since it is not flattened like the latter, 
