Faraday, Mr., on the expulsion of carbonic acid gas.
Feldspar, fusibility of. -in radiating crystals. -Labrador, ejected.
Feldspathic lavas. -at St. Helena. -rock, alternating with obsidian. -lamination, and origin of.
Fernando Noronha.
Ferruginous superficial beds.
Fibrous calcareous matter at St. Jago.
Fissures of eruption.
Fitton, Dr., on calcareous breccia.
Flagstaff Hill, St. Helena.
Fleurian de Bellevue on sphaerulites.