418 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
crystallization when cold, even in prolonged storage. This has 
been attained by using the minimum amount of lime necessary 
to combine with the sulphur, and by keeping the clear concen- 
trate in tight containers. | 
The relative amounts of sulphur in solution in the common 
lime-sulphur wash and two commercial preparations, one being 
of low density and the other of high density, are as follows: 
TABLE I.— SoLUBLE SULPHUR IN LIME-SULPHUR MIXTURES. 




Sulphur Sale Thio- 
Degrees in Total Wide sul- Lime 
Beaumé, one sulphur. ny Hitt phate (CaO). 
barrel. SMpAet-F suinnur, 
Lbs Per ct IPEVECl. | Peren Per ct 
2Common lime- sulphur wash. 6.6 Ls 3.50 2.40 1.10 3.00 
Commercial concentrated 
lime-sulphur solution, low 
Gensityierst We ase eres 4 26.8 95 18.70 16.50 2.20 8.20 
Commercial concentrated 
lime-sulphur solution, high 
density fh. PRA 34.5 135 26.50 25.60 0.90 10.90 
VARIATIONS IN COMMERCIAL MIXTURES. 
Density of clear solution.—Variations in the degree of con- 
centration of the commercial lime-sulphur mixtures may occur 
with different barrels of the same brand. Some companies 
compounding these sprays have apparently not been able to 
produce a wash of definite strength or have failed to realize 
the importance of maintaining a uniform grade for their pro- 
duct. In the early history of concentrated-wash making, it 
was apparently a difficult matter to make the different boilings 
of uniformly high density, and frequently preparations from 
the same firm showed considerable variation in the amount of 
*This wash was prepared after the common formula of lime 20 Ibs., 
sulphur 15 lbs. and water 50 gals. It is probably a stronger mixture than. 
is generally made. 
