416 REPORT OF THE DEPARTMENT OF JENTOMOLOGY OF THE 
INTRODUCTION. 
There is at the present time much demand for information 
along various phases of the subject of sulphur sprays. These 
demands the Station has attempted to meet: —- (1) By a chem- 
ical study of the compounds formed in making a lime-sulphur 
wash; (2) by the determination of the composition of various 
commercial brands; and (3) by experiments, which are to 
Serve as a basis for recommendations of the concentrated solu- 
tions. Some of the conclusions of the chemical investigations 
have been presented,' and it is reserved for this discussion to 
present especially some practical applications of the results of 
these efforts, that there may be a better understanding of the 
nature and uses of the concentrated preparations of the lime- 
sulphur wash for orchard treatment. 
COMMERCIAL CONCENTRATED LIME-SULPHUR 
MIXTURES. 
HISTORICAL, 
The commercial lime-sulphur solutions were introduced in 
this State during 1907 and 1908, when two brands were tested 
experimentally in various communities, to determine princi- 
pally their effectiveness for the scale and blister-mite, and for 
certain fruit diseases. The satisfactory results attending some 
of these tests were given widespread notice, which encouraged 
a much more extensive use of these mixtures during the past 
spring. The demand for the commercial brands prompted 
other companies to compete for the trade, so that there are now 
at least five companies which are selling their preparations to 
the fruit growers of this State. The mixtures were generally 
sold at from 17 to 20 cents a gallon according to the locality 
of the purchaser. In some communities, where competition 
was keen, the cost was as low as 15 cents a gallon. The sales 
for the spring of 1909 amounted to approximately 4,500 barrels. 

See Bulletin 319 of this Station by Dr. L. L. Van Slyke, C. C. Hedges 
and A. W. Bosworth. (Reprinted on pages 352-387 of this Report.) The 
analyses given in this article were kindly furnished by these authors. 
