_Zn_ 65.3
Zirconium. Zr 90.6
--_Am. Jour. Pharm._
[Footnote 1: Has priority over niobium.]
[Footnote 2: Now split into neo-and praseo-didymium.]
[Footnote 3: Has priority over beryllium.]
[Footnote 4: Standard, or basis of the system.]
* * * * *
THE TANNING MATERIALS OF EUROPE.
The tanning materials of Europe are of an altogether different type
from those of the United States. The population is so dense that the
quantity of home materials produced is not nearly proportionate to the
amount consumed, and consequently they must draw upon surrounding
lands for their supply. The vegetation of these adjacent countries is
of a much more tropical nature, and it naturally follows that the
tanning materials are also of a different species.
Tanning materials may be divided into two great classes, viz.:
Physiological and pathological.
PHYSIOLOGICAL.
The first class includes those tannins which are the results of
perfectly natural or normal growth, and a growth necessary to the
development of vegetation, for instance, bark, sumac, etc., whereas
the second class contains those which are the results of abnormal
growth, caused by diseases, stings of insects, etc. An example of this
is the gall. Both of these classes are used to a great extent in
Europe, while only the first division is in general use in the United
States.
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