A satisfactory anser to the question I hav placed at the hed of this articl can only be got by means of an examination of statistics carefully compiled. If we coud obtain statistics shoing the rate of mortality from small-pox among two bodies of persons, similarly circumstanst as to ages, occupations, conditions of life, and other things; and differing only to this extent, that all the persons in the one body had been vaccinated, and none at all in the other body; then an examination of such statistics woud giv a conclusiv anser to the question. But such statistics ar clearly unattainabl. Those that ar forthcoming wil be more or less deficient in the accuracy we hav supposed; and our conclusions will therefore only hav a greater or less degree of probability. acording as the statistics ar more or less complete and accurat.