on Mosquito Extcnnijiation. 31 



Chairman : We will now be addressed by Dr. J. C. Perry, 

 Passed Assistant Surgeon, who also represents General Wy- 

 man. 



GOVERNHENT ANTI-MOSQUITO WORK. 



Dr. J. C. Perry. 



I have not prepared a paper because I did not expect 

 to be called upon to read one. However, I notice on the 

 program a reference to the work done by the United States 

 Public Health and Marine Hospital Service and I would like 

 to make a few remarks upon that subject. I shall be brief and 

 will detain you only a short time. 



The Public Health and Marine Hospital Service is keenly 

 alive to the danger of transmission of disease by mosquitoes 

 and I have been much interested in the subject. All varieties 

 of mosquitoes and their extermination are interesting sub- 

 jects, but sanitarians are particularly interested in two vari- 

 eties, the anopheles and stegomyia. These are the most dan- 

 gerous, although the ordinary species of culex cause some 

 trouble. 



The anopheles mosquito is domestic in its habits, but wild 

 in birth. It generally breeds in shallow ponds and any stag- 

 nant water, but not as a rule in broken bottles and rain-barrels 

 about the house, and the elimination of this species of mosquito 

 is principally an engineering problem. The measures to be 

 adopted are the drainage of ponds and other accumulations of 

 stagnant water. These measures would be the most efficient, be- 

 cause they would give permanent results. General policing 

 of the premises should also be carried out, and as a temporary 

 expedient coal oil should be used to kill the larval forms. This 

 temporary expedient is to give immediate protection, while 

 organic improvements are instituted for permanent results. 

 Stagnant pools should be filled or drained. 



The Marine Hospital Service has obtained marked results 

 by the screening of patients suffering with transmissible dis- 

 eases and using oil to destroy the larvae. 



The most dangerous species and one of special interest is 

 the Stcgotnyia fasciata, which is a factor in the transmission 

 of yellow fever. This is a domestic mosquito. It breeds around 

 the house in broken bottles, water barrels, flower pots, tracks 



