day he complained of violent pain in his head and back,
accompanied with vomiting and much fever. The next day he was
very well and went to work as usual. The punctured part began to
spread, and there was the areola around the inoculated part to a
considerable extent.

"As this is contrary to an assertion made in the Medical and
Physical Journal, No. 8, I thought it right to give you this
information, and remain,
"Dear sir, etc.,
"J. FEWSTER."

It appears, then, that the animal economy with regard to the
action of this virus is under the same laws as it is with respect
to the variolous virus, after previously feeling its influence,
as far as comparisons can be made between the two diseases.

Some striking instances of the power of the cow-pox in suspending
the progress of the smallpox after the patients had been several
days casually exposed to the infection have been laid before me
by Mr. Lyford, Surgeon, of Winchester, and my nephew, the Rev. G.
C Jenner. Mr. Lyford, after giving an account of his extensive
and successful practice in the vaccine inoculation in Hampshire,
writes as follows:

"The following case occurred to me a short time since, and may
probably be worth your notice. I was sent for to a patient with
the smallpox, and on inquiry found that five days previous to my
seeing him the eruption began to appear. During the whole of this
time two children who had not had the smallpox, were constantly