Comets and Meteors Their phenomena in all ages; their mutual relations; and the theory of their origin.

The Popes and Science The History of the Papal Relations to Science During the Middle Ages and Down to Our Own Time

Washington's Masonic Correspondence As Found among the Washington Papers in the Library of Congress

A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Lecture VI. (of VI.), "Lectures to Working Men", at the Museum of Practical Geolo