It is well known that the microscopist can readily distinguish potato
starch from all other starches by the size of the grains. Saare has
found that the size of the potato starch granules increases with the
quality of the starch. In first quality starch they have an average
diameter of 33 micro-millimeters, in second grade 21, in third grade
17, in the rinsing water 12, and in that floated off on the water
only 8 micro-millimeters. Saare's paper may be found in full in the
_Zeitschrift fur Spiritusindustrie_, vi., 482.
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