"faint" after they have been on the handkerchief a short time.

PINE-APPLE.--Both Dr. Hoffman and Dr. Lyon Playfair have fallen
into some error in their inferences with regard to the application of
this odor in perfumery. After various practical experiments conducted in
a large perfumatory, we have come to the conclusion that it cannot be so
applied, simply because when the essence of pine-apple is smelled at,
the vapor produces an involuntary action of the larynx, producing cough,
when exceedingly dilute. Even in the infinitesimal portions it still
produces disagreeable irritation of the air-pipes, which, if prolonged,
such as is expected if used upon a handkerchief, is followed by intense
headache. It is obvious, therefore, that the legitimate use of the
essence of pine-apple (butyric ether) cannot be adapted with benefit to
the manufacturing perfumer, although invaluable to the confectioner as a
flavoring material. What we have here said refers to the artificial
essence of pine-apple, or butyrate of ethyloxide, which, if very much
diluted with alcohol, resembles the smell of pine-apple, and hence its
name; but how far the same observations are applicable to the true
essential oil from the fruit or epidermis of the pine-apple, remains to
be seen _when_ we procure it. As the West Indian pine-apples are now
coming freely into the market, the day is probably not distant when
demonstrative experiments can be tried; but hitherto it must be
remembered our experiments have only been performed with a body
_resembling in smell_ the true essential oil of the fruit. The physical
action of all ethers upon the human body is quite sufficient to prevent
their application in perfumery, however useful in confectionary, which
it is understood has to deal with another of the senses,--not of smell,
but of taste. The commercial "essence of pine-apple," or "pine-apple
oil," and "jargonelle pear-oil," are admitted only to be _labelled_
such, but really are certain organic acid ethers. For the present, then,