Edward Jenner — "The Cow Pox, when it has once taken place, is a security against the Small Pox f…"
The Cow Pox, when it has once taken place, is a security against the Small Pox for life.
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More from Edward Jenner
"I have been so much engaged in making experiments, that I have had no time to write letters."
"...has effectually put a stop to the sneers of those little minded persons who think everything impossible which does not come within the narrow sphere of their own comprehension."
"The most pleasing part of my life has been spent in the pursuit of knowledge."
"The most beautiful flowers are often found in the most obscure places."
"I have often wished that I had more time to devote to my favourite studies."