FERNANDO NORONHA; TERCEIRA; TAHITI, ETC.
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FERNANDO NORONHA. Precipitous hill of phonolite.
TERCEIRA. Trachytic rocks: their singular decomposition by steam of high temperature.
TAHITI. Passage from wacke into trap; singular volcanic rock with the vesicles half-filled with mesotype.
MAURITIUS. Proofs of its recent elevation. Structure of its more ancient mountains; similarity with St. Jago.
ST. PAUL’S ROCKS. Not of volcanic origin. Their singular mineralogical composition.
FERNANDO NORONHA.