The practice of inoculation justified : a sermon preached at Ingatestone, Essex, October 12, 1766, in defence of inoculation. To which is added an appendix on the present state of inoculation; with observations, &c / by Robert Houlton.

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The practice of inoculation justified : a sermon preached at Ingatestone, Essex, October 12, 1766, in defence of inoculation. To which is added an appendix on the present state of inoculation; with observations, &c / by Robert Houlton. Credit: Wellcome Collection. Public Domain Mark