2. The Acrid Principle Is Not Always Volatile.--This is shown
by the fact that large quantities of the mashed or finely
grated corms of the Indian turnip and allied species, produced
no irritation of the eyes or nose even when these organs were
brought into close contact with the freshly pulverized
material. This certainly is in marked contrast with the effect
produced by freshly grated horse-radish, peeled onions, crushed
mustard seed when the same test is applied.
