35 
Thinking the subject worthy of investigation, I made a few experi- 
ments with this substance, but the results were far from being satis- 
factory. I dissolved the sublimate in cold water by frequent stirring ; 
this required about 15 minutes, and the solution was of a dark bluish- 
gray color. Following is a brief account of these experiments: 
(224) Corrosive sublimate, 24 ounces; water 100 gallons. Sprayed 
on an orange tree infested with the red scale at 3 p. m., October 10, sun 
shining, light breeze. November 13, leaves and fruit uninjured; found 
great many living red scales on this tree. 
(223) Corrosive sublimate, 44 ounces; water, 100 gallons. Sprayed 
on an orange tree at 2:30 p. m., October 10, sun shining, light breeze. 
November 13, leaves and fruit aeqareon found great many living red 
scales on this tree. 
(236) Corrosive sublimate, 1; pounds; water, 100 gallons. Sprayed 
on a dormant pear tree infested with the San José scale at 10 a. m., 
December 31, sun shining, light breeze. February 3, found a great 
many living San José scales on this tree. 
The price in this city of the corrosive sublimate in 10-pound lots is 
at the rate of $1.40 per pound; at this rate the strongest solution I 
used (experiment 236) would cost about $1.63 per 100 gallons. I did 
not test a stronger solution than this, since its cost alone would prevent 
its being extensively used. 
GLUE.—For the purpose of testing this substance as an insecticide 
for the destruction of the red scale on citrus trees I made a few experi- 
ments with it, but with very unsatisfactory results. The grade I used 
is of a light brown color, not the white, nor yet the poorest grade, but 
such as is used by cabinet-makers. To dissolve the glue I simply boiled 
it in water, and it dissolved in about 10 minutes. Following is a brief 
account of these experiments: 
(227) Glue, 44 pounds; water 100 gallons. Sprayed on an orange 
tree infested with the red scale at 4:30 p. m., October 11, sun shining, 
light breeze. November 13, leaves and fruit uninjured; found great 
many living red scales on this tree. 
(226) Glue, 8.1 pounds; water 100 gallons. Sprayed on an orange 
tree at 4p. m., October 11, sun shining, light breeze. November 13, 
leaves and fruit uninjured; found great many living red scales on this 
tree. 
(225) Glue 124 pounds; water 100 gallons. Sprayed on an orange 
tree at 3:30 p. m., October 11, sun shining, light breeze. November 13, 
leaves and fruit uninjured; found great many living red scales on this 
tree. 
In this city (Los Angeles) the price of glue of the above grade in 10- 
pound lots is at the rate of 50 cents perpound; at this rate the strongest 
solution I used (experiment 225) will cost $6.25 per 100 gallons. This, 
of course, is much too expensive for ordinary use as an insecticide, and 
for this reason I did not test a stronger solution. 
