The plan of this book is as follows. A brief summary is first given of the general principles that govern the formation of types in art; the development of the type of each god or goddess, genius or hero, is historically considered. In a matter like this it is essential that the method should be historical; only so can it appear that the development of art types is subject to the same laws, follows the same inevitable sequence of development and decay, as may be observed in any other department of human civilization.