6
Book i., Part iv., Section 5.
7
Laws of Thought, p. 29. It is pointed out in the preface to this Second Edition that Leibnitz was acquainted with the Laws of Simplicity and of Commutativeness.
CHAPTER III. PROPOSITIONS.
1
Prior Analytics, i. cap. xxvii. 3.
2
Encyclopædia Britannica, Eighth Ed. art. Logic, sect. 37, note. 8vo. reprint, p. 79.
3
De Morgan, On the Root of any Function. Cambridge Philosophical Transactions, 1867, vol. xi. p. 25.