18 BULLETIN 1252, U. S. DEPARTMENT OF AGRICULTURE. 
through a sieve to break up the lumps and mixing to a slush with 
a little water. The mixture should be stirred at imtervals and 
more water (3 or 4 gallons) added as needed to form a moderately 
thick paste. It is then covered and allowed to stand four to five 
minutes. If on slightly stirring it is found to be growing thinner 
and softer and the lght sulphur yellow changing to a brownish 
color, the process is finished, and cold water should be gradually 
stirred in. 
If at the end of four or five minutes the mass has not softened 
or darkened distinctly on testing with the paddle it should be im- 
mediately covered and allowed to stand for another period of four 
or five minutes. This may be repeated until the above change has 
occurred and then the action checked by the addition of cold water. 
The mixture is then ready to be strained into the spray tank, diluted, 
and applied. If the mixture is allowed to remain hot for 15 or 20 
minutes after the slaking is completed a part of the sulphur will 
probably have gone into solution, combining with the lime to form 
sulphids. The resulting spray may be injurious to peach foliage, 
t - 
oecreaneb reecenviee «-semver PX has greater fungi 
TREATIIENT ATER HOLLIE AO SPORE cidal value and is pre- 
Gs po & a a apes | eee eee 
NIPOLEON | prunes. The stage at 
Se which cold water 
should be added to 
UNV SPLAVED stop the cooking va- 
ries with different 
AILL LEPRIETIES limes. Some limes 
ries hikes a are so sluggish in 
UNSPRIYED slaking that it is diffi- 
cult to obtain enough 
heat from them to 
Fic. Se eS of 28 Bs Bee ES I cook the mixture at 
brown-rot on sprayed and unsprayed cherries in if- : : 
ferent holding and shipping tests. all, while other limes 
become intensely hot 
on slaking, and care must be taken not to allow the boiling to proceed 
too far. After using self-boiled lme-sulphur it is important to wash 
the spray tank and pump thoroughly to remove sediment. 
BORDEAUX MIXTURE. 
Bordeaux mixture is made of copper sulphate (bluestone), lime, 
and water. As ordinarily used on prunes for the control of brown- 
rot it consists of 4 pounds of copper sulphate, 4 pounds of stone lime, 
and 50 gallons of water. To prepare the spray it is most convenient 
to make stock solutions of copper sulphate and lime. A stock solu- 
tion of copper sulphate is made by dissolving it at the rate of 1 
pound to 1 gallon of water. It is convenient to make up stock solu- 
tions in 50-gallon lots, 50 pounds of copper sulphate being placed 
in a clean gunny sack and suspended just beneath the surface of an 
equal number of gallons of water in a barrel (one with wooden 
hoops being preferable). This will dissolve in 24 hours, or sooner 
if hot water is used. A gallon of this stock solution then contains 
1 pound of copper sulphate.t The lime is prepared by slaking 
1 Always stir the stock solution before dipping any out. 
