"I have often wished that I had more time to devote to my favourite studies."

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

"The most beautiful part of the human frame is the eye; and yet it is the most liable to disease."

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

"The cow-pox is a mild disease, and never fatal; the small-pox is a formidable one, and often fatal. The cow-pox is not infectious; the small-pox is highly so."