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. 



nth and 4th segments are 



H. C. PRATT, 



iovcvnment 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 cam' on investigations for the 

 above department pending the completion of the laboratory in the 

 buildings now 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 

 ot 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 carbon bisulphide in an apparatus that might be 

 various estates without expert supervision. The 

 valuable insecticide for more pests, including tne 

 itt> ->™+ ( i_ '1 : — IK, ^mir^A hpre. has 



efficacv of th 

 destructive w 

 already been 



ia vcuuauie insecticide lor more pesib, iuuuu»- 6 

 hite ant, for which it is principally required here, has 

 proved, but the great objection to its use in this 

 — u } ls me 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 Doctor of 

 Agriculture before my arrival with an apparatus devised by hi* 

 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 tempera^; 

 and its preparation consists essentially in passing sulphur V*&* 

 over red hot carbon (usually in the form of wood charcoal) in 

 absence of air or oxygen in" Ions iron or earthenware retorts, a' 

 condensing the gas which is evolved. 



