"I have never been a lover of controversy; but when truth is concerned, I am not afraid to speak out."

"I have often been struck with the wonderful harmony that prevails throughout the works of nature."

"The most pleasing part of my life has been spent in the pursuit of knowledge."

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

"The most beautiful flowers are often found in the most obscure places."