I.,] 



corred the style; bul we prefer to publish it in the original form, because 

 of the historical interesl of the document. The reader will find in it a clear 

 statement of liis, Dr. Finlay's opinion, to the effed thai the virulence of 

 a mosquito will increase with the distance of time from the date of biting. 

 Dr. Finlay being anxious to verify the Eacts, such as he remember them, 

 concerning the history of this document, the present writer called on l>r. 

 Davis lasi Pall, bringing with him the original manuscript and the letter 

 with wich Dr. Davis returned the document. The former Editor of the 

 Journal of tht America/n Medical Sciences was able to verify the facts, as 

 le- remembered distinctly the history of the manuscript. 



.1 iiiiii ('mili i a . 



Transmission of Yellow Fever by the Culex Mosquito 1; 



The criticism of my theory on the transmission ami prevention of 

 Yeii,,u Pever through the agency of mosquito inoculation by my friend 

 Dr, Sternberg, shows that my views on that gubjed have excited, in the 

 United states, less curiosity to enquire into their details than has been the 

 case in Prance, where during the last eighl years they have been quoted 



and discussed by SUCh authorities as ('orre. 1,'odiard. Berenger Feraud, in 



a manner that scarcely justifies Dr. Sternberg's a priori rejection of the 



whole subject ¡is lieiieath his consideration. I may he allowed therefore to 

 draw a summary of the evidence apon which my ''.Mosquito Theory" now 



rests, the more so as some of the daia had not been included m my previou ■ 

 article. (Am. Journal of .'/"/. Sciences, October 1886) hut. lie scattered in 

 other papers published in the Spanish or Prench languages, while others 



will now he given for Hie first time. 



As mentioned in a former article, tie- firsl idea of the mosquito as the 



habitual agent of transmission of the disease arose from the difficulty of 



accounting for the peculiarities observed in the propagation of Yellow 

 Pever linder any other supposition hut that of an infection produced by a. 



natural inoculating agent, which should first become contaminated from 



the patient and afterwards communicate tie- d¡ lease by inoculating 



susceptible persons with the germs that it had picked up and retained. 



This natural agenl mighl or mighl not be present in a locality where a. 



I; Manuscript dated L891. Uevi '« <'< Medicina Tropical, Havana, .Inly L903, 



t. IV, ,,. 121. 



