Given a perfectly healthy individual who has never been vaccinated. We say to such a one, you must be vaccinated or you are liable to catch small-pox, which is often about. Let us pause to note clearly that the individual thus warned by us as being liable to catch small-pox is perfectly healthy. Now let us vaccinate this perfectly healthy person, and, the vaccination succeeding, we say he is henceforth protected from small-pox. That is to say, this thoroughly healthy non-vaccinated person becomes more or less proof against the contagion of small- pox by vaccination, or, at any rate, it is so averred.
It may be safely admitted that no one can be more than perfectly healthy, and may modification oar altering of perfect health must result in a minus, i.e., less than perfect health; and less than perfect health must necessarily be disease or ill health of some sort and in some degree.
Hence it follows that the protective power of vaccination is due to a diseased state of the body. (See Remarks on Homoeoprophylaxis further on.).