New YorK AGRICULTURAL EXPERIMENT STATION. 369 
pears or should appear as suJphides. While less thiosulphate 
appears with the use of larger amounts of lime, the difference 
is really less than appears, because some of the thiosulphate 
changes into sulphite sulphur and appears in the sediment as 
insoluble calcium sulphite and sulphate. It is noticeable that 
the combined sulphur in the sediment increases usually when’ 
thiosulphate decreases, though the amounts changed are not 
equivalent, owing probably to imperfections in methods of 
analysis. This change of thiosulphate into sulphite sulphur 
takes place easily and attention has already been called to it 
(p. 364). 
Taking up the second point mentioned above, viz., the 
amounts of higher sulphides (CaS, and CaS,) present in solu- 
tion, we have seen that, in the compound containing more 
sulphur (CaS,), we have 4 parts by weight of sulphur for one 
part of calcium; and, in the compound containing less sulphur 
(CaS,), we have 3.2 parts of sulphur for one of calcium. If 
we assume one or both of these two compounds to be the only 
sulphides of calcium present in solution, we can calculate the 
respective amounts of each. This has been done and the re- 
sults are presented in the table following. 
TABLE VI.— PROPORTIONS OF CALCIUM PENTASULPHIDE (CAS,) AND 



TETRASULPHIDE (CAS,) IN SOLUTION. 
Percentage|Percentage | Amount Amount 
Formul febunin|fulpeuttin plea nage Hie 
ormula. : sulphur in } sulphur in | sulphide sulphide 
eee Sheree solution solution (CaS.) | (CaSs) 
ent to-sulphur.| Present as | present as in 50 in 50 
ota A D : tetra- penta- gallons gallons 
Sulphur. Lime. sulphide | sulphide of of 
(CaS,4). (CaS;). solution. solution. 
Lbs LOS? eG S Per ct. Perce Lbs. Lbs. 
tan 25 ay 1 aye Ve 16.7 83.3 1520 89.4 
1-b ss ar 1 Bho Lhe 100.0 00.0 84.0 00.0 
1—¢ iy od 1 3.96 li Pos 94.7 4.9 88.1 
Gre Me BASS 60 1 3.68 40.0 60.0 40.1 60 .2 
2-—b sf ¥ 1 3.86 16.7 Sono 1b ta) Simo 
2-¢ f & i hance hay 18) (axe ys) (0) 78.8 D602 
Suan Loo 65 1 ols 100.0 00.0 93 .4 00.0 
3-b cS s ices och 100.0 00.0 114.4 00.0 
3-C ¥ 4 1 el 100.0 00.0 Fise3 00.0 

