Burrows declares that in the absence of further evidence he would not hesitate to pronounce a person insane if he could perceive certain associate odors.

Sir William Gull and others are credited with asserting that they could detect syphilis by smell.

Weir Mitchell has observed that in lesions of nerves the corresponding cutaneous area exhaled the odor of stagnant water.

Hammond refers to three cases under his notice in which specific odors were the results of affections of the nervous system.

One of these cases was a young woman of hysterical tendencies who exhaled the odor of violets, which pervaded her apartments.