Sentence:  <WSD>Euphorine</WSD>, it would appear, exerts its specific action directly on the micro-organism; but in the tissues -- in other words, in clinical cases -- this action is notably increased by the circumstance that <WSD>euphorine</WSD> decomposes, and the decomposition, in part, generated phenic acid. 
Meaning of the word marked with <WSD> tags:  (phenylurethan), when used medicinally.