60 Twenty-seventh Annual Report of the
method for the determination of both calcium and magne-
sium. This work has led us to adopt, tentatively, a modifi-
cation of the method worked out by Behrman last year, ("A _
Rapid Method for the Analysis of Limestone for Agricultural
Purposes/ by A. S. Behrman, Thesis for the degree of B. S.
in Industrial Chemistry, State University, Lexington, Ky.,
June, 1914). In this method, the neutralizing power of the
limestone is first determined by dissolving a weighed portion
of the finely ground sample in a known measure of standard '
hydrochloric acid and titrating the excess with standard
alkali and phenolphthalein, after boiling off the CO: and
peroxidizing any ferrous compound with a little HzO2, sub-
stantially as described by Behrman. Where the limestone is
only slightly magnesian, this determination is all that is
required to give a good estimate of its agricultural value.
But if it is desired to actually determine the amount of calcium
present as is the case with magnesian limestones, we make
the same solution up to volume, without filtering, pipette out
an aliquot, add a suitable quantity of ammonium chlorid,
heat to boiling and precipitate with ammonium oxalate. The
precipitate, containing the calcium as oxalate, is filtered,
washed and the oxalate determined by titration with stand-
ard KMnO solution in the usual way. From the neutralizing
power and the amount of calcium thus found, the amount of
magnesium present may be easily calculated. The results
are accurate enough for practical purposes. The manuscript
for a bulletin containing more than 1000 analyses of Kentucky
limestones has been prepared and is ready for publication.
MINERAL AND POTABLE WATERs. More or less quantita-
tive work has been done upon 129 samples of mineral and
potable waters from 43 counties. Such of these analyses as
are believed to be of permanent value have been compiled
and are submitted herewith for publication, (See pages
85-118 of this report).
PLANT Foon IN SOLUTION IN THE Winans or SPRINGS
AND STREAMS. Analyses of 32 samples of waters of springs
and streams of the state have been made to determine the