34 
to me in regard to it. Some of the trees sprayed by this solution 
would be very much whitened, as if whitewashed, whereas other trees 
sprayed from the same tank as these would be scarcely discolored by 
the wash. Itis, of course, the slaked lime added to the solution that 
causes it to give the trees the appearance of having been whitewashed, 
since neither the salt nor the sulphur discolor the tree to any appreci- 
able extent, and the same is true of the bisulphite of lime, which is pro- 
duced by boiling the quicklime and sulphur together. 
The cost of 100 gallons of this wash according to prices furnished me 
by Howell & Craig, wholesale grocers, of this city, for the sulphur and 
salt, and by the Southern California Lumber Company, also of this 
city, for the lime, is as follows, the materials being purchased in large 
quantities : 
Sulphur, so pountds;av2+ cents per pounds jas) 1 os sass eee eee $0. 70 
Lame, 42 pounds, ati, ofa cent per pound 2... 44-52 s2-- eee eee 533 
Salt,2o pounds, ab op) Of a) Cont per pound.)-se eee e-=s eae eee silil 
Dotalsssscmsnssuthecccksees se ckuas as tose teccee wes ceemerneeers $1.14 
The salt quoted aboveisapoor grade, such as is used for salting hides, 
and the price quoted is by the ton; the sulphur is in sacks, and the 
lime in barrels containing about 220 pounds each. 
Of the two washes above described—the resin, caustic soda, and fish 
oil, and the lime, salt, and sulphur washes—the one containing resin is 
greatly to be preferred. Not only is this wash easier to prepare than 
the other, but it is also much easier to apply it to the trees, since it is 
perfectly soluble in water and therefore does not require to be stirred 
while being sprayed upon the trees. For this reason more uniform re- 
sults will be obtained by its use than would be obtained by using the 
sulphur wash. Moreover, the resin wash, by being properly diluted, 
can ‘also be used in the summer season, and thus only one wash need be 
used at any time of the year. In my own experiments better results 
were obtained by the use of the resin wash than were produced by the 
sulphur wash. The price per gallon of each of these washes is about 
the same. The sulphur wash should never be used on trees in leaf nor 
on those just starting to leaf out, and this is also true of the resin wash 
when made according to the formula given in the preceding article. 
MISCELLANEOUS EXPERIMENTS. 
CORROSIVE SUBLIMATE (also known as mercuric chloride, HgCl2).— 
Some time ago one of the Horticultural Commissioners of San Ber- 
nardino County remarked to me that he had used a simple solution of 
corrosive sublimate for the purpose of destroying various kinds of scale 
insects on nursery trees, and had obtained very good results by the 
use of the same; and it was also reported in some of the San Diego 
papers that a gentleman living in that county had obtained better re- 
sults by the use of a solution of the above kind than he had by using 
any other kind of insecticide for the destruction of the black scale. 
