ON CLASSIFICATION OF PERSONS EXPOSED TO SMALLPOX, 511 



Passengers Unvaccinated. 



There were nineteen persons who had never been vaccinated. 



Table I. 



Classifying nineteen unvaccinated persons by their ages, and 

 showing the number that escaped, the number attacked, the 

 degree of illness in each case, and the number that died. 



Percentage attacked, 78.9; pei'centage of attacks fatal, GO per 

 cent. 



1 . This child was successfully vaccinated Dec. 27, and fell ill Dec. 30 ; the rash aborted 

 at the 5th or 6th day. 2. This child lost one eye. 3. This child lost both eyes. 



Passengers alleging vaccination, but showing no scars. 



There were sixteen persons of whom vaccination was alleged 

 but whose arms showed no scars ; fourteen of them were over 

 twenty years of age. Two were attacked, and both recovered. 

 One, a man aged thirty-eight, sufiered slightly, developing only 

 about one hundred vesicles in all. The other, a girl aged seven, 

 was re-vaccinated December 28 ; and as the operation seemed 

 likely to fail, it was repeated on January 2, with ultimate success. 

 But on January 5 she fell ill ; six or seven vesicles appeared, 

 which aborted at an early stage. 



Passengers who had been vaccinated and re-vaccinated. 



There were fifty-five persons who had been vaccinated and re- 

 vaccinated before embarking. They are classified in the following 

 table : — 



