By
electrolyzing the resulting solution a mixture of gold and silver will
be deposited upon the cathode, which can then be parted by nitric acid
and tested for as described.
DISCUSSION.
The chairman said that there was little doubt but that further
investigation into electrolytic methods of chemical analysis would
give even more valuable results than those already obtained.
Systematic investigations of the subject, such as have been given by
Dr. Kohn, would go far to prove the adaptability of this method as a
substitute for or aid in ordinary qualitative examinations. The
remarks of Dr. Kohn respecting quantitative examinations were very
interesting, and well worth following up by other practical work.
Professor Campbell Brown said that Dr. Kohn had shown that electricity
brought the same kind of elegance, neatness, and simplicity into
analysis that it did into lighting and silver plating.
In its applications to the detection of poisons, he understood Dr.
Kohn to say that the poisons must first be extracted by chemical
means. That would not be sufficient, and he had no doubt that if the
subject was pursued farther they would have a paper from him (Dr.
Kohn) some day, indicating that he had obtained arsenic and such
poisons without the previous separation of the metal from organic
matter.
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