Claude Bernard is one of the greatest of all men of science said a historian of Harvard University. His career is a most interesting and instructive chapter in the history of the progress of physiology and experimental medicine. It is difficult for one who has not followed closely the progress of science to appreciate the full merit of the original work accomplished by Claude Bernard, and the immense influence which he and his followers have exerted by the impulse they have given to the experimental and deductive method. This book deals with the history of the life, accomplishments and discoveries of this great scientist.