Longitudinal vibrations, b. [44].
Lunisolar year, a. [120].
Lymphatics, b. [453].
Magnetic elements, b. [222].
Magnetic equator, b. [219].
Magnetism, b. [217].
Magneto-electric induction, b. [256].
Matter and form, a. [73].
Mean temperature, b. [146].
Mechanical mixture of gases, b. [172].