New York AGricutruraAL EXPERIMENT Station. 365 
to state. In the case of experiments 2-a, 2-b, 2-c, when we 
used 60 pounds of lime, the calcium sulphide appears to be 
largely pentasulphide in two cases and a mixture in the other, 
with the tetrasulphide predominating. When the largest 
amount (65 pounds) of lime was used, the tetrasulphide ap- 
pears to be the only form present, so far as the ratio indi- 
cates anything, since we have about 3.2 parts of sulphur for 
one of calcium. In this case, it is noticeable, as already stated, 
that we have the largest amount of sulphide sulphur in solu- 
tion. From these results, it appears, according to our interpre- 
tation, that a considerable excess of lime gives a larger yield of 
Soluble sulphide sulphur but that this is largely or wholly 
tetrasulphide (CaS,); in other words, the increased yield of 
sulphide appears to be at the expense of the pentasulphide 
(CaS,;), which is supposed to be more efficient as a scalecide 
than the tetrasulphide. 
(3) Composition of sediment.—The more important con- 
stituents of the sediment in these experiments are the different 
forms of sulphur and the calcium. In the sediment or undis- 
solved portion, we find uncombined or free sulphur, and sul- 
phur combined in the forms of calcium sulphite (CaSO,) and 
calcium sulphate (CaSO,). The various percentages are 
tabulated below. The specific gravity of the sediment varied 
considerably according to composition; it averaged about 2.5, 
one gallon weighing about 20 pounds. 
TAere IIJ.— PERCENTAGE OF CONSTITUENTS IN SEDIMENTS. 


Sulphur. Calcium 
No. of Formula oxide 
experi- —— Calcium (CaO) 
ment. Uncom- In form In form equivalent 
Sulphur. Lime. bined of of to calcium. 
or free. sulphite. | sulphate. 
Lbs Lbs Per ct Per ct. Per ct Ber ct Per ct 
eae che 125 52 3 PY MEETE 0.02 12.63 17.68 
EO = alow i 60.32 4.43 0.93 US tal 19.20 
1—¢ = us 23 .94 iivcoo O26 27 .54 38.56 
2-a 125 60 9.07 20.18 (O)y 18! 31.89 44 64 
R=Disge 6h %- W + 3.32 22.66 0.03 32.86 46.00 
2-C vs se 8.61 21°33 0.06 31.63 44.28 
Sheet! OC 125 65 30.12 Sirol | de seaity 34 . 20 47.88 
jet Op Be ea ‘< oe 0.24 22.80 OR 31.67 44 34 
Ba Oe, tT am s g 0.43 PAs piel 976 0.62 30.25 9.35 
