Amolanas, Las.
Amygdaloid, curious varieties of.
Amygdaloids of the Uspallata range. —of Copiapo.
Andesite of Chile. —in the valley of Maypu. —of the Cumbre pass. —of the Uspallata range. —of Los Hornos. —of Copiapo.
Anhydrite, concretions of.
Araucaria, silicified wood of. Arica, elevation of.
Arqueros, mines of.
Ascension, gypsum deposited on. —laminated volcanic rocks of.
Augite in fragments, in gneiss. —with albite, in lava.
Austin, Mr. R.A.C., on bent cleavage lamina.