Small Pox.—Dr. J. K. Mitchell, of Philadelphia, one of theJP^bysieians of the Alins House and Small Pox Hospital, has publish-ed a statement, founded on his observation and that of Dr. John Bell, which exhibits very strongly the value of Vaccination as a protection against the fatal effects of this disease, although it shows, at the same time, that it does not entirely prevent the recurrence of the disease. The statement embraces 145 cases of small pox, or varioloid, which have occurred at Philadelphia Of these, 48 occurred in persons who had previously had the vaccine disease, and no one died. Eight cases occurred in persons who had previously *had the small pox, and of this number four died. The other ninety-five cases occurred in persons who had previously had neither disease, and of these, 32 died and 41 recovered. T wo of the persons who had the small pox a second time, took it naturally the first time. Eight of those who took the disease after the vaccine, had been vaccinated recently. Some of the mildest cases were in persons who were vaccinated more than twenty years ago.