COMPOSITION OF SOME LIME-SULPHUR SPRAYS. 249 
In the case of mixtures having asp. gravity of 1°0062, 
one contains 5°5 Ibs. sulphur and 2°7 Ibs. lime per 100 gal- 
lons, while another contains 7°5 tbs. sulphur and 4°2 Ibs. of 
lime per 100 gallons. 
It has not yet been ascertained to which of these forms 
of sulphur compounds lime sulphur soiution owes its effici- 
ency, nor what proportion of this efficiency is due respec- 
tively to the monosulphide form, the polysulphide form and 
to the thiosulphate form. 
In the absence of this information it was thought that 
the examination of a particularly concentrated form of 
lime-sulphur mixture manufactured abroad, and which has 
given highly satisfactory results over a wide range of 
country, at certain observed dilutions, would be desirable. 
This concentrated lime sulphur mixture was examined 
with the following results :— 
Specific Gravity... eh 1 Ea elesOLls 
Degree Baumé mote ; Bae 1. Oo OF 
Composition in grams per 100 (os 
Monosulphide sulphur de bts Say OOo 
Polysulphide sulphur oe He ..», 20° OL 
Thiosulphate sulphur Ae pe ee OO 
Sulphate and sulphite sulphur _... cane et LO 
Total sulphur ... wits ai se OODLE 
Total lime - Be: ay wae), Lomo 
The percentages of the various forms of sulphur in per- 
centage of total sulphur are:— 
Monosulphide sulphur a és ... 19°60 
Polysulphide sulphur ae bes LOO 
Thiosulphate sulphur ee Mi 4°61 
Sulphate and sulphite sulphur _... Aree 4) 
Total sulphur ... ane As, ... L00°00 
Field experience has shown that the best results obtained 
for (a) winter use is by mixing one volume concentrated 
spray with 10 volumes of water, and (b) for summer use by 
