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Vaccination is one and an important cause of our increasing population; small-pox, in olden times, decimated the country.

46. But vaccination does not always protect a child from small-pox?

I grant you that it does not always protect him, neither does inoculation; but when he is vaccinated, if he take the infection, he is seldom pitted, and very rarely dies, and the disease assumes a comparatively mild form. There are a few, very few fatal cases recorded after vaccination, and these may be considered as only exceptions to the general rule; and, possibly some of these may be traced to the arm, when the child was vaccinated, not having taken proper effect.

If children and adults were revaccinated,—say every seven years after the first vaccination,—depend upon it, even these rare cases would not occur, and in a short time small-pox would only be known by name.

47. Do you consider it, then, the imperative duty of a mother in every case to have, after the lapse of every seven years, her children revaccinated?