REPorR’T OF THE CHEMIST. Bn 
was used, and the amount decreased when larger amounts of 
lime were used. Calcium sulphite was present in smallest 
amounts when the least amount of lime was used. 
4. Experiments in boiling mixture different lengths of time. 
— Different mixtures were boiled 45, 60 and go minutes, with 
the following results: 
(a) The largest amount of soluble sulphides was formed by 
boiling about one hour, especially when the largest amount 
of lime was used. 
(b) In general, increased length of boiling decreases the 
amount of thiosulphate and increases the amount of sulphite. 
(c) The amount of sediment increases with length of boil- 
ing, owing to increased formation of calcium sulphite, etc. 
The amount of free sulphur in sediment decreases with length 
of boiling. 
5. Home-made preparations.— Examination was made of 
concentrated home-made mixtures and of dilute mixtures pre- 
pared according to the formula, 15 pounds of sulphur and 20 
pounds of commercial lime. The results were not as satis- 
factory as in case of the other preparations already described, 
probably due to use of impure lime. In the case of the 15-to-20 
formula, the sulphide compounds of calcium appear to be de- 
composed forming compounds containing much less sulphur 
than the tetrasulphide (CaS,). 
6. Effect of adding lime to diluted lime-sulphur solution.— 
A concentrated solution was diluted to 50 gallons, using 8 gal- 
lons of water for 1 gallon of concentrate, and 10 pounds of 
lime then added. The amount of sulphide sulphur was de- 
creased, while thiosulphate was increased with formation of 
free sulphur. The higher sulphides of calcium were decom- 
posed, forming compounds containing less sulphur. The 
changes thus caused may be so great as to seriously decrease 
the insecticidal power of the mixture. 
7. Use of sediments in making lime-sulphur wash.— When 
nearly pure lime is used, the sediment consists largely of 
calcium sulphite (CaSO,), free sulphur, hydroxide and car- 
12 
