74 SUMMARY OF THE ANTIMALARIAL CAMPAIGNS 



perfect and the water allowed to pool, as has occurred 

 in connection with some banana plantations. In these 

 cases the careless planting of the banana trees has 

 brought about, it is stated, an increase of malaria. 



With regard to preventive measures, the authors 

 have cited the prejudice which has to be overcome 

 in the first instance. Much of this, they point out, 

 comes of the fact that the older residents cannot 

 understand that it is one special group of mosquitos — 

 the anophelines — which are the carriers of the disease. 

 They are bitten by harmless mosquitos and wonder 

 why they do not get malaria, and reason in conse- 

 quence that they are either proof against malaria or 

 that mosquitos are not the transmitters of the disease. 

 Or they travel and stay in intensely malarial places, 

 but owing to the fact that they are to a considerable 

 degree immune to the irritating action of the bites 

 of mosquitos generally, they don't feel the bites of 

 the anophelines which are present ; they become in- 

 fected with malaria, but affirm that they were not 

 bitten. 



Segregation. — The authors also discuss the marked 

 difficulties of segregation, the colonists being obliged to 

 live close to their workmen. On the other hand, they 

 point out how rational and justifiable it is to protect 

 the susceptible new-comer from the danger of close 

 dwelling with those who, although harbouring the 

 parasites, are not inconvenienced by the disease, but 

 nevertheless are capable of commimicating the disease, 

 a disease which will have a disastrous effect upon the 

 new-comer. 



