Mechanico-chemical sciences, b. [191].

Meiocene, b. [529].

Meridian line, a. [164].

Metals, b. [306], [307].

Meteorology, b. [138].

Meteors, a. [86].

Methodic school (of medicine), b. [439]. [36]

Metonic cycle, a. [122].

Mineral alkali, b. [264].

Mineralogical axis, b. [537].