The third great falsehood in this tissue of Jennerian mendacity is the claim that one vaccination rendered the vaccinated person “_perfectly secure_” “_through life_” from “_the infection of the smallpox_.” This was, of course, a most reckless and absurd claim on its face, for how could Jenner, with a few experiments and tests extending over a few years, declare with any honesty, or with any logical or scientific warrant, that cowpox inoculation gave _absolute security from smallpox for life_? This reckless claim was, of course, soon proved to be a rank falsehood by the wide-spread failure of vaccination to protect from smallpox as soon as the vaccinated persons were exposed to actual infection or epidemic conditions where they readily contracted the disease, as they do to this day notwithstanding their vaccination! A new apology had therefore to be invented for this wholesale failure of vaccination soon after its first adoption, and this was made by abandoning the false claim of unlimited life protection from one vaccination and substituting the modified claim of a limited protection for seven years--more or less--and the consequent necessity of frequent or periodical re-vaccinations to get any continued or reliable protection from the operation. Now Jenner’s original false and absurd claim of unlimited or life protection from one vaccination was probably partly due to his ignorance of the real nature and history of smallpox and his credulous adoption of the old fallacy and superstition, in common use, that one attack of smallpox gave sure immunity for life from a second attack, which proposition never really had any scientific basis in theory or fact, as it has been repeatedly proved that smallpox may, and often does, occur two or three times in the same person, whether vaccinated or unvaccinated, and that there is no regularity or certainty in the alleged protection given either by smallpox or vaccination, but that immunity depends largely on sanitary, hygienic and constitutional conditions. In fact, some students seem to think that the person who has once had smallpox is more likely to have it again than one who has never had the disease! It was, therefore, at this first demonstrated failure of vaccination to protect from smallpox that Jenner’s chief assistant, Dr. James Moore, wrote a very interesting little book called “The History of Small Pox,” London, 1815. The chief purpose of this book was to apologize for the failure of vaccination to protect from smallpox, as originally falsely claimed by Jenner, by showing that even smallpox does not protect with certainty for life or any other period, but that the same person may have smallpox two or three times in succession, instances of which are cited all through the book, thus making the ingenious or crafty plea for vaccination that it cannot be expected to give any more protection than smallpox gives; and therefore reliance must not be placed on one vaccination alone for life, but