130 MOSQUITOES 



now been definitely determined, the specific cause of this 

 disease remains to l)o discovered. 



A larg-e supply of contaminated mosquitoes, carefully 

 preserved, has been brought to Washing'ton by Drs. 

 Keed and Carroll and careful work is now being carried 

 on in an effort to find the causative organism of the dis- 

 ease. It seems quite probable that it will prove to be 

 some sporozoon, following in a measure a somewhat 

 similar life-round to that of the malarial organisms. 



It is interesting to note that the very recently pub- 

 lished " Interim Report " of Herbert E. Durham and the 

 late Walter Myers, to the Liverpool School of Tropical 

 Medicine, based on observations on yellow fever in Bra- 

 zil, in the course of which Dr. Myers died, just as did Dr. 

 Lazear in Cuba, indicates the belief of these investigators 

 in the causative effect of a small bacillus which they 

 found in the organs of ail fatal cases. They conclude 

 that the yellow fever is not due to a protozoon, and with 

 regard to the American results, they make the following 

 comment : " The endeavor to prove a man-to-man trans- 

 ference of yellow fever by means of a particular kind of 

 gnat, by the recent American Commission, is hardly 

 intelligible for bacillary diseases. Moreover, it does not 

 seem to be borne out by their experiments, nor does it 

 appear to satisfy endemiological conditions." It is 

 obvious that this report of the English investigators was 

 prepared before the final and more complete paper of 

 the American Commission was read by Dr. Heed in Hava- 

 na, and even with this granted, it was hardly fair in them 

 to style the investigations of the Americans " an endeavor 



