486 



the gaseous mixture. A rough diagram * is included in 

 Appendix A. Failing carbon bisulphide, solid calcium car- 

 bide may be used ; 



(c) That whenever a tree falls from the attacks of white 

 ants, it should be split open, the earthy matter within 

 removed and well mixed with lime, the stump dug out and 

 burnt together with the trunk. The hole should be filled in 

 with earth and lime and ground changkoled within a radius 

 of 20 feet. This should be done immediately on the fall of 

 the tree and especial promptitude is indicated if the event 

 happens at all near the swarming season ; 



\d) That the larger mound-building species be not inter- 

 fered with, as in this country they largely take the place of 

 earth worms in more temperate climates, and play an 

 important part in the economy of nature by rapidly con- 

 verting dead timber and decaying vegetable matter into a 

 form immediately available for plant nutrition ; 



(e) That the possibility and even probability of mismanaged 

 and neglected estates becoming a breeding ground for 

 T. gestroi and hence a source of danger and expense to their 

 neighbours, be seriously considered by the Planters' Associa- 

 tion. 



XVIII. — Conclusion. 



In conclusion, I must express my acknowledgments for the 

 great assistance rendered to me by the planting community in 

 general, and to Mr. P. W. Parkinson, of Sungei Rengam Estate, 

 in particular, to whom I am indebted for much material aid- and 

 many valuable suggestions, which are embodied in the present 

 report. 



HERBERT C. ROBINSON, 



Curator. 



Selangor State Museum, 

 Kuala Lumpur, 13th October, 1904. 



APPENDIX A. 



Manufacture and use of Carbon Bisulphide. 



Theoretically, ioo lbs. of sulphur should yield i ig lbs. of carbon 

 bisulphide, but after allowing for leakage and loss from imperfect 



* Not printed 



