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The resin, caustic soda, and fish oil are placed in a suitable vessel 
and the 15 gallons of water is added all at one time. The heat is then 
applied, and just as soon as the mixture comes to a boil, which will in 
a measure depend upon the strength of the fire, the preparation becomes 
clear brown, indicating that it is ready to be removed from the fire. 
When allowed to cool this mixture is of a yellowish color and some- 
what opaque. As already indicated, however, it readily mixes with 
cold water, forming a brownish, clear solution entirely free from flaky 
masses of soap. 
For use in the greenhouse in combating red spider on violets, climb- 
ing asparagus, and roses, we dilute the stock preparation at the rate of 
1 to 3, that is, 1 part of stock solution to 3 parts of water. This is 
rather strong, and perhaps for all ordinary purposes 1 to 4 will have 
sufficient strength. The concentrated wash made up in accordance 
with the foregoing formula will cost approximately 4§ cents per gallon, 
not counting the labor, which will not exceed 10 cents for the 15 gallons 
of wash, making the total cost of the stock preparation approximately 
5^ cents per gallon. Prepared by the old formula the total cost will 
be not less than 6 J cents a gallon for the concentrated wash, estimating 
the cost of labor at 30 cents. These figures are valuable only in a com- 
parative way, as the actual cost of the washes could probably be reduced 
one-third by making them in large quantities and buying the ingredients 
at wholesale prices. As a matter of fact, the 98 i>er cent caustic soda can 
be obtained in 400-pound barrels for 6£ cents per pound, or in broken 
lots for 8^ cents per pound. The 70 per cent caustic soda costs about 
4£ cents in 600-pound drums and 7 cents per pound in small quantities. 
The granulated soda is much more convenient to handle than the other 
form, and furthermore, it requires no preliminary treatment, such as 
breaking up, dissolving in water, etc. 
As already indicated, we have used the resin wash in combating red 
spider on violets and have found it very efficient. It seems to me that 
the compound is worthy of trial in greenhouses as a remedy for sooty 
mold, red spider, and plant lice. 
(6) Resin-wash-kerosene emulsion. — It has been found that a thick 
emulsion can be made by churning together while cold equal parts 
of the imperfect resin wash made with an excess of caustic soda and 
kerosene. This emulsion, however, is not stable, probably owing to 
the fact that the proper proportions have not been worked out. The 
emulsion may be diluted to almost any strength and in this condition 
is more stable than when not diluted. A more stable and in fact a 
better emulsion may be made by using the kerosene and the diluted 
resin wash in strengths ranging from 1 to 5 to 1 to 20. These emul- 
sions are milky white and show upon standing very little free oil. Kot 
enough experiments have been made, however, to warrant any definite 
statements in regard to the preparation. The emulsions were suggested 
to Mr. Marlatt, who has already given his experience with them in 
treating the pear-tree Psylla. 
