A non-mathematical survey of the fundamental forces of nature and some relationships among them. This is a series of lectures aimed at young people. He starts off with the most fundamental and familiar forces of all: Gravity and Heat. Then by a progression of examples and experiments goes on to describe atomic/molecular adhesion in solids, liquids and gases, which he groups under the rubric of "Chemical Affinity". And, no collection of Faraday's theories could omit his discoveries in Electricity and Magnetism.