Dr. Colin expresses what is now the common medical opinion in saying, “We must not stop at a single vaccination. We must establish the firm conviction in the public mind, that vaccine prophylaxy is only real and complete when periodically renewed;” and Dr. Warlomont, chief of Belgian vaccinators, goes yet further in advising and practising what he calls _Vaccinisation_; which is, that every subject of the rite be vaccinated again and again until vesicles cease to respond to the insertion of virus. Then, and then only, can the victim be guaranteed from smallpox! Such are the shifts to which vaccinators have been reduced. If their insurance were valid, the premium would exceed the principal, whilst there is no reason to believe the new security is a whit better than the old. In these frantic prescriptions we see the quackery in its death-throes. ABSURDITY OF REVACCINATION. As for revaccination keeping off smallpox, it is absurd, and ought to be known for absurd. The chief incidence of smallpox is among the young, in whom it cannot be pretended that the influence of primary vaccination is exhausted. The subjects of revaccination are passing, or have passed out of the smallpox age; and as the statistics of the army and navy prove, our soldiers and sailors are no more exempt from smallpox than the unrevaccinated civil population of corresponding years. In this matter, the old words stand true, _Populus vult decipi; decipiatur_. THE REDUCTION OF SMALLPOX. From whatever side regarded, the original and successive claims made for vaccination are seen to have broken down; but a practice endowed and enforced as a poll-tax for the benefit of the medical profession is not lightly surrendered. Instead a variety of defences, more or less ingenious, are thrown out. I.--One of these is the reduction of smallpox. It is said, “Smallpox was once a common disease, and is now a comparatively rare one--How are we to account for this improvement otherwise than by the introduction of vaccination?” The answer is, that smallpox was declining before vaccination was introduced, and that, too, in spite of the extensive culture of the disease by variolation; and the decline continued during the first part of the present century whilst as yet nine-tenths of the people were unvaccinated. Several diseases once common have abated or disappeared; and why should we attribute to an incommensurate cause a similar abatement in smallpox? Leprosy, once extensively prevalent in England, has disappeared. Why? It died out gradually; but suppose some rite, analogous to vaccination, had been brought into vogue contemporaneously with its decline, would not the rite have had the credit, and would not its practitioners have called the world to witness the success of their prescription? HAS VACCINATION SAVED LIFE?