Page:Scientific Papers of Josiah Willard Gibbs - Volume 2.djvu/283

Rh potential (electrical and gravitational) was treated in a separate book, which appeared in 1859, with the title, "Die Potentialfunction und das Potential, ein Beitrag zur mathematischen Physik." This subsequently went through several editions, in which it was revised and enlarged. All these subjects, with others, were brought together in a single volume, "Die mechanische Behandlung der Electricität," which appeared in 1879, forming the second volume of his "Mechanische Wärmetheorie." Later papers on electricity related to the principles of electrodynamics, electrical and magnetic units, and dynamo-electric machines. The Royal Society's catalogue of scientific papers, and the excellent indices to the Annalen der Physik und Chemie, in which Clausius's work usually appeared, render it unnecessary to enumerate in detail his scientific papers. The list, indeed, would be a long one. The Royal Society's catalogue gives seventy-seven titles for the years 1847–1873. Subsequently twenty-five papers have appeared in the Annalen alone, and about half as many others elsewhere.

But such work as that of Clausius is not measured by counting titles or pages.a His true monument lies not on the shelves of libraries, but in the thoughts of men, and in the history of more than one science.