Note (return) — Replies.
Reading edition
Non-recurrence, or immunity from any future seizure in a person who has had an infectious disease, seems derivable from some invisible and unknown impression[4] made on the constitution. There is good reason to suppose that this impression may vary in degree in different individuals, and in the same individual at different times; and thence some practical inferences are to be drawn which have not yet been well advanced into popular view, but to which I cannot advert unless some reader of "N. & Q." put the question.