"The wise man will not be content with the knowledge of things as they are, but will seek to know how they came to be so."

"It is by experiment alone that we can arrive at the knowledge of nature."

"As art is a habit with reference to things to be done, so is science a habit in respect to things to be known."

"The heart is a muscle, and its function is to pump blood."

"The circulation of the blood is a discovery that overthrows all the ancient doctrines of medicine."