Thomas, D., dip of the rocks in western New York, xviii, 375.
—, on coal formations in New York, xix, 326.
—, on physical climate, xix, 361.
—, Chrysomela vitivora, xxvi, 113.f
—, on the American locust, xxi, 188.
—, specific characters of two species of Corydalis, xxvi, 114.f
—, description of a new Ulmus, xix, 170.f
—, on a new species of Liatris, xxxvii, 338.f
—, on frogs and toads in rocks, xix, 167.
Thomas, E., improvements in the microscope, xix, 57.f