—, Gothic style, notice of, xviii, 220.
Architectural improvements, E. Lord, xxv, 304.
— monuments, xviii, 229.
Arctic regions, sketch of geology of, xvii, 1.
Argentine, notice of, C. Dewey, vii, 248.
—, analysis of, C. Dewey, vi, 333.
—, locality of, in Massachusetts, viii, 34.
Argento-cyanate of silver, for fulminating silver, xviii, 335.
Argento-cyanic acid, xviii, 334.
Argillaceous slate, in western Massachusetts, viii, 18, 21, 29.