Observing that the ether was quite turbid and wishing to learn

the cause, a drop or two was allowed to evaporate on a glass
slide
Observing that the ether was quite turbid and wishing to learn
the cause, a drop or two was allowed to evaporate on a glass
slide. Examining the residue with a microscope it was found to
consist of innumerable raphides or needle-like crystals. Some
of the ether was then run through a filter. The filtrate was
clear. An examination showed it to be entirely free from
raphides, and it had lost every trace of its acridity. The
untreated acrid juice of the Indian turnip, calla, and other
plants of the same family was then filtered and in every
instance the filtered juice was bland and had lost every trace
of its acridity. These tests and others that need not be
mentioned, proved conclusively that the acridity of various
species of the Arum family was not due to a volatile principle,
but was due to the needle-shaped crystals found so abundantly
in these plants.


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