"The cow-pox protects the human constitution from the infection of smallpox."

"It is a fact well known to many, that persons who have had the Cow Pox, are for ever after secure from the infection of the Small Pox."

"The most important lesson that I have learned in life is, that we should always endeavour to do our duty."

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

"The opposition I have met with has only served to confirm me in my opinion."