13 
As the Buhach at first merely paralyzes the insect, it is necessary 
that this influence upon the latter should continue until death results. 
To accomplish this some viscid substance should be combined with the 
solution of Buhach and water, in order to cause the solution to adhere to 
the insects for a sufficient Jength of time to deprive the latter of their 
lives. One of the best known substances of this kind is glucose, a semi- 
liquid refuse of sugar refineries. This substance combines readily with 
the Buhach solution, and does not appear to have an injurious effect upon 
the plants that have been sprayed with it. A low grade of brown sugar 
would doubtless answer the same purpose, although not in an equal 
degree, not being so viscid when mixed with water. 
Besides using the Bubach in a dry form, and mixing it with water, it 
is sometimes also mixed with alcohol, in the proportion of 1 pound of 
Buhach to a quart of alcohol; this should stand in a closed vessel for an 
hour or so, when it may be diluted with water to any extent required. 
In regard to this solution Prof. E. W. Hilgard, of the University of Cali- 
fornia, writes as follows to the Pacific Rural Press of May 5, 1883 (p. 
413): 
“T find that the effect of the Buhach is materially increased in dura- 
tion when instead of the tea the diluted tincture is used, as was sug- 
gested by Professor Riley two years ago. ‘The reason is that the alco- 
hol extracts with the essential oil also a green resin, which prevents 
the too rapid evaporation of the volatile oil, and makes it stick to the 
insect. 
“A quart of alcohol to a pound of powder is the best proportion, but 
less aleohol may be used. Thealcohol may simply be left on the powder 
for an hour, and the whole then put into 45 or 50 gallons of water, if to 
be used through a ‘San José nozzle.’ But it is far better to let the 
alcohol percolate through the powder, and thus get a clear tincture, of 
which aliquot parts may at any time be used through any nozzle what- 
soever, after proper Gilution with water. Thus it becomes a great con- 
venience, since the insecticide solution is ready at any moment without 
need of boiling or dissolving,and thus the work may be done just when 
wanted without any preparation. I find a solution made as above 
quite strong enough for any ordinary insect, including the hairy cater- 
pillar, which at first seems not to mind it much, but after a while tum- 
bles down and succumbs after vain efforts to crawl away. I have not 
had an opportunity of trying it upon the Diabrotica or ‘spotted lady- 
bug,’ but am told that it also succumbs despite its ability to eat almost 
anything from tobacco to belladonna and henbane. All the aphids 
yield to it at once, as does the Red Spider when hatched; but it will 
not kill eggs.” 
In using the Buhach out of doors the best effect will be obtained 
when the weather is stili and rather cool. In very hot weather the in- 
secticidal properties of the Buhach evaporate too rapidly, thus render 
ing its time of action so brief as to permit the insect in many cases to 
