362 REPORT OF THE CHEMIST OF THE 
In the laboratory experiments pure lime (calcium oxide) 
was used. The amount of lime theoretically required to com- 
bine with 125 pounds of sulphur to form calcium pentasulphide 
(CaS,) in largest amounts is about 60 pounds. It is seen, then, 
that in the first formula, the lime was not sufficient in amount 
to combine with all the sulphur. In the second formula the 
proportions are about those called for by theoretical consider- 
ations, while the third formula represents proportions that give 
more lime than is needed to form calcium pentasulphide. 
The mixtures were made up to the equivalent of 50 gallons 
by the addition of water. At the same time, experiments were 
made in the case of each formula to ascertain the effects of 
boiling the mixture for varying periods of time, 45, 60 and 90 
minutes. In order to avoid too great duplication of tabulated 
data, we give all the results together, discussing them sepa- 
rately as far as practicable. In comparing the results in the 
following tables, one must, of course, take into consideration 
the length of boiling and, in studying the different formulas, 
compare the results of experiments in which the boiling was 
carried on for the same length of time. This is facilitated by 
the manner in which the experiments are numbered. 
(1) General character of preparations made. Below we give 
in tabulated form under each of the formulas used (1) the 
specific gravity and degrees Beaumé of the mixtures with and 
without the sediment or undissolved material and (2) the 
amounts of solution and sediment. 
In this connection, we will call attention to the observed 
color of the solution and sediment. The clear solutions were 
much alike in color, appearing orange-red or reddish-yellow 
when seen in a quart fruit jar; when seen in deeper layers, the 
color appears a deep claret. The color of the sediment was 
practically the same in all cases. As seen in the mixture, the 
sediment appears olive-green; but when removed, washed and 
dried, it appears white or grayish white. When a sample of 
the dried white sediment is again mixed with some of the clear 
solution, it soon acquires an olive-green color. Therefore, the 
color of the sediment, as seen in the lime-sulphur mixture, is . 
due to the combined color of solution and solid. 
