94 SANITATION AND HYGIENE ON TROPICAL ESTATES 



cent, or more, especially when the force works for day 

 wages. On a malarious estate in Selangor, having a 

 manager and six assistants, there have been occasions 

 when only one has not been confined to his quarters with 

 malaria. Efficient management is impossible under such 

 conditions. 



In conclusion, it may be remarked that anti-malarial 

 measures require to be carried out with a thoroughness 

 which can only be appreciated by those connected with 

 the work, and no anti-malarial measure is likely to 

 succeed unless it is under the immediate supervision of a 

 responsible and competent officer who is keenly interested 

 in its success. Medical officers can effect little as regards 

 thorough drainage without the co-operation of engineers, 

 and it rests with them, therefore, not only to initiate 

 action on this problem, but also to interest the engineers 

 who will be connected with its solution. This can rarely 

 be accomplished in any way other than by personal effort. 

 It should be borne in mind also that failure in the demon- 

 stration of measures calculated to improve health has a 

 most serious effect on public opinion and the mind of 

 authority, and it is on this account far better when 

 endeavouring to carry out such an economical improve- 

 ment as the eradication of malaria to make sure of it 

 being thoroughly well done in one locality, when the rest 

 can safely be left to public opinion and authority, rather 

 than to risk the possibility of failure, by inadequate work 

 in many localities. Reduction of malarial sickness follows 

 good thorough drainage so quickly that there is no fear 

 of the public neglecting to couple the cause with the 

 improvement. 



