15 



arsenicals and it is not likely that harm will result, at least in 

 porous soils such as prevail in rubber plantations, particularly 

 with the very small quantities of arsenic which are being used. 

 The effects of arsenic will be closely observed and if any injury 

 should manifest itself in years to come, the danger may be 

 avoided by adopting for a year or so the harmless but somewhat 

 less effective method of spraying with sulphate of iron. 



