1 8 INTRODUCTION 



The Works of Leibniz. 



Many of the most important philosophical works of 

 Leibniz were not published till after his death. Large 

 quantities of manuscript were preserved in the Royal 

 Library at Hanover, and successive editors have con- 

 tinually drawn upon it for publication. The chief editions 

 of the philosophical works are that of Erdmann (1840) 

 and that of Gerhardt (1875-90), the latter being the 

 most complete. In 1866 Janet published an edition in 

 French, containing the principal works as they are given 

 in Erdmann, with the addition of the correspondence 

 between Leibniz and Arnauld, which had not been pub- 

 lished when Erdmann's edition appeared. The mathe- 

 matical works were published by Gerhardt in seven 

 volumes (1850-63). Of the historical and political works 

 Onno Klopp published ten volumes (1864-77). Toucher 

 de Careil also published in seven volumes (1859-75) 

 some of Leibniz's political works, along with his corre- 

 spondence on the reunion of Christendom and his writings 

 in connexion with the founding of academies. In addition 

 to these may be mentioned the old edition of Dutens in 

 six volumes (1768), which contains some things not in- 

 cluded in any of the others, and the booklet of Mollat 

 (1885), containing some papers of Leibniz on ethics and 

 jurisprudence. 



The following are the principal philosophical works of 

 Leibniz, with the dates at which they were written or 

 published. The letters J. S. indicate those which appeared 

 in the Journal des Savants, and the letters A. E. those 

 which appeared in the Acta Eruditorum. Those marked 

 with an asterisk were published in Leibniz's lifetime. 



Correspondence with Philipp and others regarding the Philosophy of Descartes, 

 1679-80. (In French.) G. iv. 281 sqq. 



*Medifationes de Cognitione, Vcritate et Ideis, A. E. 1684. G. iv. 422 ; E. 79. 



Correspondence icith Arnauld, 1686-90. (In French.) G. ii. i. Pub- 

 lished by Grotefend, 1846. 



