PLATE XII. 



FIG. 1. Blood from finger of yellow fever patient in Military 

 Hospital, Havana, 1879 ; fifth day of sickness ; fatal case. X 400 

 diameters by Beck's ^ inch objective. 



FIG. 2. Blood from finger of yellow fever patient in Military 

 Hospital, Havana, 1879 ; fifth day ; fatal case. X 1450 ; Zeiss's 

 ^ inch horn, oil im. objective. 



FIG. 3. White blood corpuscle from yellow fever blood of fifth 

 day, showing fat granules. X 1450. 



FIG. 4. White blood corpuscle from yellow fever blood of fifth 

 day, showing fat granules. X 1450. 



