Science

Mental Radio

On the Continuity of Effect of Light and Electric Radiation on Matter

The Wonders of Optics

Selenium cells

The Other Side of Evolution: Its Effects and Fallacy

The micro-organisms of the soil

Telescopic Work for Starlight Evenings

The Riddle of the Universe at the close of the nineteenth century

Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida

Modern cosmogonies

The Coal Measures Amphibia of North America

Biology versus Theology

Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis

The Genetic Effects of Radiation

Guide to the Geologic Map of Illinois

Climate and Time in Their Geological Relations

Essay on the Theory of the Earth

The gradual acceptance of the Copernican theory of the universe

A Further Investigation of the Symmetrical Chloride of Paranitroorthosulphobenzoic Acid

New Species and Synonymy of American Cynipidæ