The Hood River glacier. (Hood River, Or.) 1889-1933, 1915-04-22
INSTRUCTIONS GIVEN
FOR IR0N-SuLPHID

Instead Of atomic sulphur iron-sul-
phid is often used for the calyx spray
now being applied.
Pathologist Winston, of the local ex
pertinent station. gives the following
instructions for the preparation OF iron
suplhid, the directions, IL followed,
giving 500 gallons of spray material.
Fill a 50-gallon barrel about two
thirds full of water Weigh out 10
pounds of iron sulphate (eopperas),
place in a sack. and suspend in the
water. The iron suplhste will dissolve
fairly rapidly, and when il is all IN So
luton measure out carefully 1t gallons
of commercial lime-suplhur solution
testing 80 degrees Baume, or two gal
Ions and three pints of a lime-sulphur
solution testing 80 degrees Baume.
Slowly pour all but two pints Of the
sulphur solution into the iron-sul-
phate solution in the barrel. stirring
The mixture vigorously with hoe or
shovel. The addition of the lime-sul-
phur solution will produce a bulky,
black precipitate, and when all but
two pints of the lime-sulphur solution
has been added the mixture should be
allowed to stand for few minutes,
when the black precipitate will begin
to settle and little Of the clear liquid
at the top can be carefully dipped out
with clean glass or cup. This clear
liquid will probably show no yellow
Iime-sulphur color, which means that
an excess of lime-sulphur solution has
not yet been added. In other words,
there is still some iron sulphste in So
luton, in which case the addition Of a
drop of lime-sulphur solution to the
clear hquid in the glass will produce a
black precipitate. This means that
more Iime-sulphur solution should be
added to the stock in the barrel, ard
about half of the remaining two pints
should now be poured in and the con-
tents of the barrel stirred vigorously
and allowed to stand. Some Of the
clear liquid should again be dipped off
and tested as before, to determine
whether an excess of lime-sulphur So
luton has been added. IL necessary,
the addition of small quantities of
lime sulphur solution should be cOntin-
ued until some of the clear liquid dip
ped from the top, after the contents of
the barrel have been we'll stirred and
allowed to settle, shows a pale yellow
ish lime sulphur tint. The purpose of
using slight excess of the lime-sul-
phur solution is to insure all the iron
sulphate being utilized. The volumin-
Gus black precipitate that is formed
consists of iron sulphid, precipitated
sulphur, and calcium sulphate. After
slight excess of lime-sulphur solution
has been added, the barrel should be
filled with water and the contents
stirred thoroughly and allowed to stand
for several hours. The black iron-sul-
phid mixture will settle to the lower
half or third of the barrel, and the
clear liquid should be poured off by
carefully and gradually tipping the
barrel, without allowing any of the
black precipitate to run out. The bar.
rel should again be filed with water.
and the contents thoroughly stirred and
allowed to stand several hours, and the
clear liquid poured off as before. This
operation of washing the precipitate
should be repeated until the water
poured off no longer shows the yellow
llime-sulphur tinge. Probably three OF
more such washings will be required
depending upon how careful the opera
tor has been in using only a slight ex
cess of lme-sulphur solution.
II is evident that the preparation o
this stock supply should be commenced
two or three days before the spraying
is to be done, but when once proparet
it may be kept indefinitely. IL care il
used in weighing out each lot of irol
sulphate and if the lime-sulphur solu
tion used is accurately measured ther,
will be no trouble in making up tn,
stock supplies rapidly after the frs
two or three patches have been pre-
pared, and il will be remembered tina
each batch is sufficient for making so
gallons of spray mixture. In order {
keep a supply of the stock mixture o
hand, several patches should be pre-
pared before the spraying commences
and as rapidly as barrel is emptie
the preparation of new batch shoul
be started. Iron sulphate IS compars
lively cheap. and the entire cost of ms
terials for preparing 100 gallons of tn
miIdew spray, when diluted accordin
to the recommendation given in thi
bulletin, should not exceed 10 or z
cents.