Influences, a. [219].

Intercalation, a. [118].

Interferences, b. [86], [93].

Ionic school, a. [56].

Isomorphism, b. [334].

Isothermal lines, b. [146], [538].

Italic school, a. [56].

Joints (in rocks), b. [537].

Judicial astrology, a. [222].

Julian calendar, a. [118].