n, lived as a servant with a
neighbouring Farmer thirty-eight years ago. She was then a dairymaid,
and the Cow Pox broke out among the cows. She caught the disease with
the rest of the family, but, compared with them, had it in a very
slight degree, one very small sore only breaking out on the little
finger of her left hand, and scarcely any perceptible indisposition
following it.

As the malady had shewn itself in so slight a manner, and as it had
taken place at so distant a period of her life, I was happy with the
opportunity of trying the effects of variolous matter upon her
constitution, and on the 28th of March, 1797, I inoculated her by
making two superficial incisions on the left arm, on which the matter
was cautiously rubbed. A little efflorescence soon appeared, and a
tingling sensation was felt about the parts where the matter was
inserted until the third day, when both began to subside, and so
early as the fifth day it was evident that no indisposition would
follow.

_CASE IX._

Although the Cow Pox shields the constitution from the Small Pox, and
the Small Pox proves a protection against its own future poison, yet
it appears that the human body is again and again susceptible of the
infectious matter of the Cow Pox, as the following history will
demonstrate:

William Smith, of Pyrton in this parish, contracted this disease when
he lived with a neighbouring Farmer in the year 1780. One of the
horses belonging to the farm had sore heels, and it fell to his lot
to attend him. By these means the infection was carried to the cows,
and from the cows it was communicated to Smith. On one of his hands
were several ulcerated sores, and he was affected with such symptoms
as have been before described.

In the year 1791 the Cow Pox broke out at another farm where he then
lived as a servant, and he became affected with it a second time; and
in the year 1794 he was so unfortunate as to catch it again. The
disease was equally as severe the second and third time as it was on
the first[1].

In the spring of the year 1795 he was twice inoculated, but no
affection of the system could be produced from the variolous matter;
and he has since associated with those who had the Small Pox in its
most contagious state without feeling any effect from it.

[Footnote 1: This is not the case in general--a second attack is
commonly very slight, and so, I am informed, it is among the cows.]

_CASE X._

SIMON NIC