"The valves in the veins are so constructed as to permit the passage of blood towards the heart, but to prevent its return."

"I profess both to learn and to teach anatomy not from books but from dissections; not from the tenets of philosophers but from the fabric of nature."

"The blood flows from the right ventricle through the lungs to the left auricle."

"The life of man is a perpetual motion."

"The circulation of the blood is a new doctrine, and I doubt not but it will meet with its opponents."