| [The Seasons] | [47] |
[Why their varying temperature?]—[A new philosophy].
[CHAPTER VII.]
| [Gravity] | [50] |
[Its essential nature and its source].
[CHAPTER VIII.]
| [The Atmosphere] | [52] |
[A veritable ocean]—[How constituted]—[The vito-magnetic principle, its extent and character]—[Its functions]—[The air not yet comprehended]—[Have we been mistaken?]—[New light]—[Electrical induction]—[Its mode of action and illustrations]—[The character and virtue of the vito-magnetic element].