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). 
