PHILOSOPHY OF NATURE LEIBNITZ'S IDEAS. 61 



memoranda, is unfinished in several respects. Still it has an interest as 

 the sketch of some ideas upon history and opinions which I have since 

 unfolded at greater length. See particularly my essay entitled " Leib- 

 nitz, the Naturalist, Physiologist, and Physician" ("Comptes rendus of 

 the Academy of Moral and Political Sciences," 1873). 



