"The human mind is a wonderful machine; but it is also a very delicate one."

"The pursuit of knowledge is an endless one; but it is also a most delightful one."

"I have always been a lover of nature, and I have always found great pleasure in studying her works."

"The progress of science is slow, but it is sure."

"The Cow Pox, when it has once taken place, is a security against the Small Pox for life."