“…For instance, such powerful alkaloids as atropine, morphine, nicotine and aconitine, when adminstered to animals or applied to animal tissues in sufficiently minute doses, effect a stimulation or, as it is often termed, a "therapeutic" action, while in larger doses they act as potent poisons, producing death of organism or tissue. Similarly, it has recently been shown that such a deadly poison as cobra venom is a valuable therapeutic agent when employed in sufficiently small doses (Macht, 1936). Even such a well-known poison as sodium cyanide, for instance, administered in minute doses, may be a useful drug, stimulating the activity of the respiratory center in higher animals instead of effecting the paralysis that follows ingestion of larger doses of the same poison (Lovenhart, 1918).…”