88 N. J. Mosquito Extermination Association 



southeastern Missouri the malaria death rate for 1911-17 was 156.6 

 per 100,000 against 71.6 during 1918-19, a reduction equivalent to 

 54.3 per cent. 



-The economic data of the Mound area clearly indicate a substan- 

 tial per capita crop reduction as the result of malaria occurrence. 

 In this case also the earlier conclusions advanced by Captain Van 

 Dine can no longer be used as indicative of present conditions, 

 largely af¥ected, of course, by the price of cotton and the dis- 

 turbed industrial conditions resulting from the war. The investi- 

 gation includes an analysis of the cotton-ginning statistics of Madi- 

 son Parish in indicating a maximum ginning period during the two 

 weeks of November i to 14 which is at variance with statistics for 

 the Yazoo Delta. 



The address, in its final form, will include a considerable amount 

 of new statistical material, amplified by observations derived from 

 recent foreign investigations, including particularly the malaria 

 research in Great Britain under Sir Ronald Ross and Col. S. P. 

 James, and the really extraordinary malaria surveys of Bengal 

 under Dr. Charles A. Bentley, as well as the admirable malaria 

 report and anopheles survey for the Colony of Trinidad and Tobago 

 tinder Deputy Surgeon-General C. F. Lasalle. We have as yet noth- 

 ing to compare with the scientific presentation of the results of the 

 mosquito and malaria research work which is being done in these 

 ■countries. The report on Trinidad, for illustration, includes some 

 very admirable maps showing the mosquito breeding and potential 

 l)reeding places, which are necessarily the first basis of persistent 

 mosquito reduction efforts. The Trinidad report also includes an 

 elaborate list of mosquito-breeding places, differentiating the posi- 

 tion, amplified by a descriptive account, the kind of larvae found, 

 and whether potential, temporary or permanent. The report further 

 includes observations on rice fields and mosquito-breeding places 

 produced by men, as well as on the effect of rain on mosquito preva- 

 lence, and the effect of malaria on agricultural economics. 



In its final analysis the problem of mosquito control is a national 

 or state rather than a local one; but at the same time all effective 

 measures for permanent reduction are essentially local though de- 

 pendent upon the most hearty state and national support. The effec- 

 tive co-ordination of different agencies aiming at the same objective 

 is, therefore, a question of the first importance. It is most gratify- 

 ing to be able to say that the co-operation at Mound, La., is perhaps 

 the most promising of its kind which has yet been developed in this 



