Acidum Salicylicum (Synthetic) forms a very perfect chemical substitute for salicylic acid prepared from oil of wintergreen. Physiologically, the actions of the two substances are not identical, although somewhat similar. Therapeutically, the synthetic acid serves admirably as a cheap substitute for true salicylic acid, and may be employed in the same dose and for the same indications, provided the patient is robust and has a stomach not readily disturbed. It is a very efficient antiseptic.