"WHEN once you interfere with the order of Nature there is no knowing where the results will end," was the remark made in my presence by a distinguished biologist. There immediately escaped from him an expression of vexation at his lack of reticence, for he saw the various uses I might make of the admission.
Jenner and his disciples have assumed that when the vaccine virus has passed through a patient's system he is safe, or comparatively safe, against smallpox, and that there the matter ends. I will not here say anything for or against this assumption.* I merely propose to show that there the matter does not end. The interference with the order of Nature has various sequences other than that counted upon. Some have been made known.
A Parliamentary Return issued in 1880 (No.____________________