RUDOLF JULIUS EMANUEL CLAUSIUS. 267 



potential (electrical and gravitational) was treated in a separate book, 

 which appeared in 1859, with the title, "Die Potentialf unction 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 Electricitat," 

 which appeared in 1879, forming the second volume of his 

 " Mechanische Warmetheorie." * Later papers on electricity related 

 to the principles of electrodynamics,! electrical and magnetic units, J 

 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. 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. 



und erzeugte Warme." Pogg. Ann., vol. Ixxxvii, p. 415 (1852). " Ueber die An- 

 wendung der mechanischen Warmetheorie auf die thermoelectrischen Erscheinungen." 

 Pogg. Ann., vol. xc, p. 513(1853). "Ueber die Electrieitatsleitung in Eleetroly ten. " 

 Pogg. Ann., vol. ci, p. 338 (1857). 



* The first volume of this work appeared in 1876, and contained the general theory 

 with the more immediate consequences of the two fundamental laws. The third volume 

 has not yet appeared, but it is expected very soon, edited by Professor Planck and 

 Dr. Pulfrich. In a certain sense this work may be regarded as a second edition of an 

 earlier one (1864 and 1867), which consisted of a reprint of papers and had the title 

 " Abhandlungen iiber die mechanische Warmetheorie." 



t Wied. Ann., vol. x, p. 608 ; vol. xi, p. 604. 



$Ibid., vol. xvi, p. 529; vol. xvii, p. 713. 



Ibid., vol. xx, p. 353 ; vol. xxi, p. 385. 



