Harmonics, Acute, b. [37].

Harmonics, Grave, b. [38].

Heat, b. [139].

Heat, Latent, b. [160].

Heccædecaëteris, a. [121].

Height of a homogeneous atmosphere, b. [34].

Heliacal rising and setting, a. [131].

Heliocentric theory, a. [258].

Hemisphere of Berosus, a. [162].

Hollow months, a. [122].