43 

 Conclusions 



1. It has been proved that the C. mosquito, as a rule, hites several 

 times in the course of its existence, not only when its bite has been acci- 

 dentally interrupted, but even when it has been allowed to completely 

 satisfy its appetite ; in which case two or more days intervene between its 

 successive bites. 



2. Inasmuch as the mouth-parts of the mosquito are very well adapted 

 to retain particles that may be in suspension in the liquids absorbed by 

 that insect, it cannot be denied that there is a possibility that said 

 mosquito should retain upon the setae of its sting some of the virulent 

 particles contained in a diseased blood, and may inoculate them to the 

 persons whom it afterwards chances to bite. 



3. The direct experiments undertaken to decide whether the mosquito 

 is able to transmit yellow fever in the above stated manner, have been 

 limited to five attempted inoculations, with a single bite, and they have 

 given the following results: One case of mild yellow- fever, perfectly 

 characterized, with albuminuria and icterus; two cases didgnosed as 

 ' ' abortive yellow fever ' ' by the physicians in charge ; and two ephemeral 

 fevers without any definite characters. From which results it must be 

 inferred that the inoculation with a single bite is insufficient to produce 

 the severe forms of yellow fever, and that a final decision as to the efficacy 

 of such inoculations must be deferred until opportunity is found for 

 experimenting under absolutely decisive conditions, outside of the epidemic 

 zone. 



4. Should it be finally proven that the mosquito-inoculatiou not only 

 reproduces the yellow fever, but that it constitutes the regular process 

 through which the disease is propagated, the conditions of existence and of 

 development for that dipterous insect would account for the anomalies 

 hitherto observed in the propagation of yellow fever, and while we might, 

 on the one hand, have the means of preventing the disease from spreading, 

 Tinniinmunes might at the same time be protected through a mild 

 inoculation. 



My only desire is that my observations be recorded, and that the 

 correctness of my ideas be tested through direct experiments I do not 

 mean by this that I would shun the discussion of my opinions ; far from it, 

 I shall be very glad to hear any remarks or objections which my 

 distinguished colleagues may be inclined to express. x ) 



1) N. B. The notes do not belong to the original paper. — C. F. 



