various kinds of error or misstatement which have been pointed out (pp. 25-30). * * * * * Having thus cleared away some of the misconceptions and fallacies which have obscured the main question at issue, and having shown that, by official admission, the only valuable evidence consists of “large masses of national statistics,” which should have been dealt with by a commission of trained statisticians, I proceed to show, by a series of diagrams embodying the official or national statistics brought before the Commission, or to be found in the Reports of the Registrar-General, what such statistics really prove; and I ask my readers to look again at those diagrams as I refer to them. Diagram I. exhibits the most extensive body of national statistics available, showing at one view the death-rates from Small-pox, from the other chief Zymotic Diseases, and the Total Mortality, from 1760 to 1896. The first portion, from 1760 to 1836, is from the “Bills of Mortality,” which, though not complete, are admitted to be, on the whole, fairly accurate as regards the variations at different periods and between different diseases. The second part, from 1838 onwards, is from the Reports of the Registrar-General, and is more complete in giving all deaths whatever. Its lines are, therefore, as it were, on a higher level than those of the earlier period, and can only be compared with it as regards proportions of the different mortalities, not so accurately as to their total amounts. The main teaching of this diagram—a teaching which the Commissioners have altogether missed by never referring to diagrams showing comparative mortalities—is the striking correspondence in average rise and fall of the death-rates of small-pox, of zymotics, and of all diseases together. This correspondence is maintained throughout the whole of the first part, as well as through the whole of the second part, of the diagram; and it proves that small-pox obeys, and always has obeyed, the same law of subservience to general sanitary conditions as the other great groups of allied diseases and the general mortality. Looking at this most instructive diagram, we see at once the absurdity of the claim that the diminution of small-pox in the first quarter of our century was due to the partial and imperfect vaccination of that period. Equally absurd is the allegation that its stationary character from 1842 to 1872, culminating in a huge epidemic, was due to the vaccination then prevailing, though much larger than ever before, not being quite universal—an allegation completely disproved by the fact that the other zymotics as a whole, as well as the general mortality, exhibited strikingly similar decreases followed by equally marked periods of average uniformity or slight increase, to be again followed by a marked decrease. There is here no indication whatever of vaccination having produced the slightest effect on small-pox mortality.