— 539 —
Secondly, No farther than we can perceive their Agreement or Disagreement.
      §2. Secondly, That we can have no Knowledge farther, than we can
have Perception of that Agreement, or Disagreement: Which Per-
ception being, 1. Either by Intuition, or the immediate comparing
any two Ideas; or, 2. By Reason, examining the Agreement, or Dis-
agreement of two Ideas, by the Intervention of some others: Or, 3.
By Sensation, perceiving the Existence of particular Things. Hence it
also follows,
Locke Hum IV, 3, §2, p. 539