"The disease has hitherto been confined to particular districts; and it has been observed, that where the Cow Pox has prevailed, the Small Pox has been much less frequent, and much less fatal."

"My mind is so completely absorbed in this subject, that I can think of nothing else."

"I have often found that the best way to learn is to teach."

"My greatest ambition has always been to be useful to mankind."

"It is a fortunate circumstance, that the Cow Pox is not infectious; for if it were, it would be a source of great alarm."