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that nasal irritation which is felt by so many persons in a hay-field.
Another correspondent, this time a man, tells me that he has noted the
resemblance of the odor of semen to that of crushed grasses. A scientific
friend who has done much work in the field of organic chemistry tells me
he associates the odor of semen with that produced by diastasic action on
mixing flour and water, which he regards as sexual in character. This
again brings us to the starchy products of the leguminous plants. It is
evident that, subtle and obscure as many questions in the physiology and
psychology of olfaction still remain, we cannot easily escape from their
 H. Beauregard, _Matiere Medicale Zooelogique: Histoire des Drogues
d'origine Animate_, 1901.
 Professor Plateau, of Ghent, has for many years carried on a series
of experiments which would even tend to show that insects are scarcely
attracted by the colors of flowers at all, but mainly influenced by a
sense which would appear to be smell. His experiments have been recorded
during recent years (from 1887) in the _Bulletins de l'Academie Royale de
Belgique_, and have from time to time been summarized in _Nature_, e.g.,
February 5, 1903.
 David Sharp, _Cambridge Natural History: Insects_, Part II, p. 398.
 Mantegazza, _Fisiologia dell' Amore_, 1873, p. 176.
 Mantegazza (_L'Amour dans l'Humanite_, p. 94) refers to various
peoples who practice this last custom. Egypt was a great centre of the
practice more than 3000 years ago.
 Hagen, _Sexuelle Osphresiologie_, 1901, p. 226. It has been suggested
to me by a medical correspondent that one of the primitive objects of the
hair, alike on head, mons veneris, and axilla, was to collect sweat and
heighten its odor to sexual ends.
 The names of all our chief perfumes are Arabic or Persian: civet,
musk, ambergris, attar, camphor, etc.
 Cloquet (_Osphresiologie_, pp. 73-76) has an interesting passage on
the prevalence of the musk odor in animals, plants, and even mineral
 Laycock brings together various instances of the sexual odors of
animals, insisting on their musky character (_Nervous Diseases of Women_;
section, "Odors"). See also a section in the _Descent of Man_ (Part II,
Chapter XVIII), in which Darwin argues that "the most odoriferous males
are the most successful in winning the females." Distant also has an
interesting paper on this subject, "Biological Suggestions," _Zooelogist_,
May, 1902; he points out the significant fact that musky odors are usually
confined to the male, and argues that animal odors generally are more
often attractive than protective.
 R. Whytt, _Works_, 1768, p. 543.
 Lucretius, VI, 790-5.
 Mohammed, said Ayesha, was very fond of perfumes, especially "men's
scents," musk and ambergris. He used also to burn camphor on odoriferous
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