New York AGRICULTURAL EXPERIMENT StTaTION. 3883 
TABLE X V.— PERCENTAGES OF CONSTITUENTS IN COMMERCIAL PREPARATIONS, 



Sulphur in mixture. Cal- Ratio 
——_—_—__—- cium of 
in cal- 
In form In In In form] com- cium 
Sample} Name of brand. of form form | of sul- | bina- to 
Total sol- of of phites | tion sul- 
‘ uble thio- free and as phides 
sul- sul- sul- sul- sul- sul- 
phides. | phates. | phur. | phates. | phides.| phur. 
—— | — | — | — 






Perch aleieem. Clan) Ler Cla er Cl. eer ClLeee er. Ci Cas 2S 
A COTASSCLTS ote 25.68 | 24.99 0.69 6.94 } 1:3.60 
B cere, 27% 24252) (523240 ele 0 (0) GO fos Pro noS 
C A eee eae 24°47 1-23-30 Tay 0 0 6.55) 10 123.56 
D INGDSAT Aa wo aes DOM LOM eae P21 | traces’) traces 6.00 P3'.68 
iE Ga Fe ae a eRe Dt ed aes 14 0.82 0.87 2.04 Geo Lesio3 
F bree oS Sie DPA ATG AN AEM OXG lees a ea bss 3.24 AX85 |e lator oe 
G ap ae ee 22287 %| 20-32 LAL OBLO 1.30 GSU tele oeoO 
H Rex VARS wo 420 1.08 0 0 GC, Zope tO 
T eT dace Sie Reece ZO OO moos 0.96 0 0 (ie (ot eh lee alae 
Ai a VARS eS ial 0 0) 6247 pele 3258 
K POMIGCTLS satretace cs Teton VoL On4. 7, P70) 0 0 AeA ol ieoal 2 
L EWE GEIR GSS 2s 26.49 | 25.61 0.88 0 0 TaZNe ES L355 


A study of the preceding table brings out the following 
facts: 
(1) Yotal sulphur.—The total amount of sulphur in these 
commercial preparations varies from 18.73 to 26.49 per ct. Ex- 
cept in the case of samples E—G, the sulphur is all in solution; 
in these three samples the sulphur in the clear solution, freed 
from sediment, is 22.56, 18.38 and 21.47 per ct. respectively. 
It would appear from these data that one should reasonably 
expect a first-class concentrated commercial preparation to 
contain about 24 to 25 per ct. of total sulphur in solution. 
(2) Sulphur in soluble sulphide form— The amount of sol- 
uble sulphide sulphur varies from 16.47 to 25.61 per ct. In 
samples A—C and H—J, the amount of sulphide sulphur is 
fairly uniform, ranging within the limits of 23 and 25 per ct. 
A high grade commercial mixture should, therefore, be expected 
to contain over 23 per ct. of soluble sulphide sulphur. So far 
as our present knowledge goes, it is the soluble sulphide sul- 
phur that is most effective in killing scale-insects and the 
amount of this form of sulphur constitutes the chief basis in 
estimating the efficiency of a lime-sulphur wash. 
