Millingen, in the Introduction to his _Vases Grecs_, drew up a classification of the subjects on vases which need not be detailed here, but which, with some modifications, may be regarded as holding good to the present day. He distinguishes ten classes, the first three mythological, the next four dealing with daily life, and the three last with purely decorative ornamentation. A somewhat similar order is adopted by Müller in his _Handbuch_, by Gerhard in his _Auserlesene Vasenbilder_, and by Jahn in his Introduction to the Munich Catalogue (p. cc ff.). In the present and following chapters the arrangement and classification of the subjects adhere in the main to the system laid down by these writers; and as the order is not, of course, chronological in regard to style, reference has been made where necessary to differences of epoch and fabric.[29] It may be convenient to recapitulate briefly the main headings under which the subjects are grouped. I. The Olympian deities and divine beings in immediate connection with them, such as Eros and marine deities. (_a_) In general; (_b_) individually. (Chapter XII.) II. Dionysos and his cycle, Pan, Satyrs, and Maenads. (Page 54 ff.) III. Chthonian and cosmogonic deities, personifications, and minor deities in general. (Page 66 ff.) IV. Heroic legends and mythology in general. (_a_) Herakles; (_b_) Theseus, Perseus, and other heroes; (_c_) local or obscure myths; (_d_) the Theban and Trojan stories; (_e_) monsters. (Chapter XIV.) V. Historical subjects. (Page 149 ff.) VI. Scenes from daily life and miscellaneous subjects (for detailed classification see p. 154). (Chapter XV.)