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sides of body, thorax, and head are single long hairs. Each 
segment, except the first thoracic and the anal, bear on either side 
four clusters of bristles. 
The spots on the sides pf the nth and 4th segments are 
sometimes more like stripes. 
H. C. PRATT, 
Government Entomologist , F.M.S. 
REPORT OF GOVERNMENT CHEMIST 
FOR THE YEAR 1906. 
I arrived in Kuala Lumpur and assumed the duties of my 
appointment on the 18th June. 
Some time was occupied in the equipment of the present 
chemical laboratory in order to carry on investigations for the 
above department pending the completion of the laboratory in the 
buildings mow being erected. 
The equipment of the new laboratory has also been almost 
completed, in readiness for agricultural chemical investigations, 
especially in connection with the rubber industry, which will have 
of necessity to be conducted in the vicinity of the experimental 
rubber plantation. 
Manufacture of Carbon Bisulphide. 
My attention has been directed chiefly to the problem of the 
manufacture of carbqn bisulphide in an apparatus that might be 
utilised on the various estates without expert supervision. The 
efficacy of this valuable insecticide for more pests, including the 
destructive white ant, for which it is principally required here, has 
already been proved, but the great objection to its use in this 
country is the cost of shipping, the liquid, owing to precautions 
which must be taken on account of its great volatility and 
inflammability. 
The problem had already been commenced by the Director of 
Agriculture before my arrival with an apparatus devised by him 
in conjunction with Mr. Kelway Bamber, Government Chemist 
in Ceylon. 
Carbon bisulphide is a compound of carbon and sulphur 
analogous to carbon dioxide, but liquid at ordinary' temperature, 
and its preparation consists essentially in passing sulphur vapour 
over red hot carbon (usually in the form of wood charcoal) in the 
absence of air or oxygen in long iron or earthenware retorts, and 
condensing the gas which is evolved. 
