Infinitesimals, [135].

Instants, [116] ff., [129], [151], [216].
defined, [118].

Instinct v. Reason, [20] ff.

Intellect, [22] ff.

Intelligence, how displayed by friends, [93].
inadequacy of display, [96].

Interpretation, [144].

James, [4], [10], [13].

Jourdain, [165 n.]

Jowett, [167].

Judgment, [58].