Its other use is in corn salves and corn plasters. Everyone knows that they must be green and negative. Marihuana contains a green component called chlorophyl. We have made experiments on men as well as upon animals in which we have applied the material directly through the skin, either normal skin containing a corn, and we find that it has no value in preventing pain. Cannabis or marihuana it self will not decrease the pain of a corn.
Salicylic acid causes the destruction of the corn tissue.
Cannabis is used because it has a green color, but other green dyes will be just as effective as marihuana for this purpose. On last Saturday a paper was presented before the Pharmacological Society in Memphis, Tenn. by Dr. Walton, who has been making a special study of cannabis at this time. He said the the cannabis grown in the neighborhood of New Orleans for pharmaceutical purposes was similar in chemical ingredients to that which has been bought in India and elsewhere. I take it that the effect is different upon different persons. None at all.