The mistake of the printer in substituting the word "every" for
"even," in the paper on Vaccination (p. 40), so materially affects
the sense of the passage, that I must request the favour of the
following insertion:--
"3d. That while the vaccine cicatrix retains even one distinct
fovea or depression, the individual continues unsusceptible both of
small pox and of re-vaccination; but that," &c.
I am, Sir,
Your obedient servant,