The reality of the olfactory influences with which we have been concerned,
however slight they may sometimes appear, is shown by the fact that odors,
both agreeable and disagreeable, are stimulants, obeying the laws which
hold good for stimulants generally. They whip up the nervous energies
momentarily, but in the end, if the excitation is excessive and prolonged,
they produce fatigue and exhaustion. This is clearly shown by Fere's
elaborate experiments on the influences of odors, as compared with other
sensory stimulants, on the amount of muscular work performed with the
ergograph.[79] Commenting on the remark of Bernardin de Saint-Pierre, that
"man uses perfumes to impart energy to his passion," Fere remarks: "But
perfumes cannot keep up the fires which they light." Their prolonged use
involves fatigue, which is not different from that produced by excessive
work, and reproduces all the bodily and psychic accompaniments of
excessive work.[80] It is well known that workers in perfumes are apt to
suffer from the inhalation of the odors amid which they live. Dealers in
musk are said to be specially liable to precocious dementia. The symptoms
generally experienced by the men and women who work in vanilla factories
where the crude fruit is prepared for commerce have often been studied and
are well known.
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