■condensation, it will be safe to assume that 150 lbs. of sulphur 
are required to produce 100 Mas. of C-S,. 
Plant and building; capital cost 
$2,500 
Monthly production 600 lbs. 
Sulphur, 8 cwt. at $12.50 
Charcoal, 10 cwt. at $1.50 
$100 
15 
Firewood, etc. ... 
50 
Wages ... 
40 
Interest on capital 10%, sinking fund 
15 % 52 
Repairs .. 
40 
$497 
or, roughly speaking, 50 cents per lb. 
With a consumption of 1,200 lbs. per mensem we have— 
• Establishment charges ... ... $132 
Cost of materials . .. ... ... 330 
$462 
or, $0.39 per lb., which is a very great deal lower than carbon 
bisulphide can possibly be imported for. The cost of materials, 
of wages, repairs, and capital cost of apparatus have been esti- 
mated at a very much higher rate than is likely to prevail, an 
exceedingly low condensation factor has been assumed, and a 
liberal allowance made for interest and sinking fund, 
I would, nevertheless, suggest that previous to an}’ action 
being taken, the Government should instruct the Crown Agents 
to refer the question to either Professor Tilden, F.R.S., Professor 
of Chemistry. Royal College of Science, or else to Professor 
T. E. Thorpe, of Somerset House, with the request that they 
should obtain plans for a plant on the following scale: — 
Daily production required ... ... 70 lbs. 
Working hours per day ... ... 7 
Working days per month ... 20 
Temperature of condensing water ... 8o° F. 
All parts to be easily accessible, readilv replaced and as 
uncomplicated as possible. 
APPENDIX B. 
Other Insect Enemies of Rubber., 
With the exception of Termcs gestroi both Para rubber and 
Rambong are singularly free from insect pests of all descriptions. 
* Present price in London, retail, i6/-per cwt. 
