Trisection, curves of, iv, 343.f
Troglodytes niger, xlvii, 411.
Troost, G., amber at Cape Sable, Maryland, iii, 8.
—, minerals of Missouri, xii, 376, 378, 379.
—, some remarks on the coal regions of Tennessee, xxx, 391.
—, Third Report on Tennessee, noticed, xxx, 391.
—, Fourth Report on Tennessee, notice of, xxxiv, 187.
—, Fifth Report, xli, 385.
—, analysis of a meteorite from Tennessee, xxxviii, 250.
—, meteoric iron from Tennessee and Alabama, xlix, 336.f