Two on the form of the earth's surface, on the connection of continents, and the elevation of soil over ravines. Three on the sea as a globular fluid surrounding the earth. Ten on the atmosphere--as an elastic fluid surrounding the earth, and on the distribution of heat. One on the geographic distribution of organized matter in general, Three on the geography of plants. Three on the geography of animals; and Two on the races of men. These lectures are what is known as the Cosmos, and present a scientific picture of the world--of infinite diversity in unity; of ceaseless motion in the eternal grasp of law. These lectures contain the result of his investigation, observation and experience; they furnish the connection between phenomena; they disclose some of the changes through which the earth has passed in the countless ages; the history of vegetation, animals and men; the effects of climate upon individuals and nations; the relation we sustain to other worlds, and demonstrate that all phenomena, whether insignificant or grand, exist in accordance with inexorable law. There are some truths, however, that we never should forget: Superstition has always been the relentless enemy of science; faith has been a hater of demonstration; hypocrisy has been sincere only in its dread of truth, and all religions are inconsistent with mental freedom. Since the murder of Hypatia in the fifth century, when the polished blade of Greek philosophy was broken by the club of ignorant Catholicism, until today, superstition has detested every effort of reason.