370 REPORT OF THE CHEMIST OF THE 
On the basis of the data presented in this table, it is seen 
that the largest amount of the higher sulphide (CaS,) is pro- 
duced when the least amount of lime is used or, stated another 
way, when the sulphur is in excess compared with the lime. 
When the largest amount of lime is used, the sulphide appears 
to be entirely in the form of calcium tetrasulphide (CaS,). 
While the largest yield of sulphide sulphur comes with the use 
of the largest amount of lime, the compound formed is ap- 
parently all tetrasulphide; and when the least amount of lime 
is used, less sulphide is formed but a larger proportion of it is 
pentasulphide. As previously stated, it is at present supposed 
that the pentasulphide has more powerful insecticidal proper- 
ties than the tetrasulphide, though we must regard this view 
as a Supposition and not as yet experimentally established. 
EXPERIMENTS IN BOILING LIM£-SULPHUR MIXTURE FOR DIFFERENT 
LENGTHS OF TIME. 
The effect of heating lime-sulphur mixtures was tested with 
the three different formulas previously considered. The special 
points to be noticed are the amounts and composition of solu- 
tion and sediment. From the data already presented, we have 
selected those contained in the following table to cover the 
points of special importance. 
TABLE VII.— EFFECT OF BOILING FOR DIFFERENT LENGTHS OF TIME 
ON LIME-SULPHUR MIXTURE. 




























Solution. Sediment. 
Formula. Time Su] oe ; State 
of Sires Ma gh ve hte Aime ine 
boil- Wt Heal as as noe Wt pis phur Lime 
ing. , sitet: $B he SUL Bh inse , hursi ee oman 
Sul- hides | SUl-_ | phide. : e phite 
phur. Lime. PAICES | phates. etc.) 
Lbs Lbs. | Min. | Lbs. Los. | Los. | Lbs. Lbs. Lbs. Lbs. Lbs. Lbs. 
125 ay 45 | 518.4} S924) 6:20 23il\e 33. Ol SO EL 16.6 1228 0.5 2.9 
5 - 60° | 51250] G84 Ol PLGeol or time Oo. Cine 20) a) meee ded 3.8 
os x 90 | 491.0} 93.0 Sf ikoeee 40.4] 36.0 8.6 Gsdl lone 
125 % 45 36513).0| LOO Zo ly ke cole oo? dian Onc leme Oreo te Lea aarti | 
¢ " 60 | 509.0} 105.0 O20) 38 lik 426.0lee co 30 0.9 > 9|=aton 
3 . 90 | 504.0] 105.0 7.8} 43.2] 50.0] 37.0 ee 7, Ol 1654 
125 ; 45 0) 4527.0) 9005 4160 21 Olen lel ee OO mbin ce 20),0 6.0 120 9.5 
‘. 60 | 519.3] 114.4 DH Ole aie DOsol ol we 0.1 2} Valeo 
2 f 901550930) 113.0 G26) B49 Ae oo e242 5 O.2ist0a 21.0 

