Minutes, a. [163].

Miocene, b. [529].

Mollusca, b. [478].

Moment of inertia, a. [356].

Momentum, a. [337], [338].

Moon’s libration, a. [375].

Morphology, b. [469], [474].

Movable polarization, b. [105].

Multiple proportions (in Chemistry), b. [285].

Music of the spheres, a. [82].