Which was first, Matter or Force? If we think on this question, we shall find that we are unable to conceive of matter without force, or of force without matter. (W. Crookes in On the various forces of nature and their relations to each other)The following publication presents the collection of lectures, discourses and speculations of Professor Faraday.Contents:THE FORCE OF GRAVITATIONGRAVITATIONCOHESIONCOHESIONCHEMICAL AFFINITYCHEMICAL AFFINITYHEATMAGNETISMELECTRICITYTHE CORRELATION OF THE PHYSICAL FORCESLECTURE ON LIGHT-HOUSE ILLUMINATIONTHE ELECTRIC LIGHTMichael Faraday was an English scientist who contributed to the study of electromagnetism and electrochemistry. His main discoveries include the principles underlying electromagnetic induction, diamagnetism and electrolysis.