Hypotheses in philosophy, [239].

Illusions, [85].

Incommensurables, [162] ff., [237].

Independence, [73], [74].
causal and logical, [74], [75].

Indiscernibility, [141], [148].

Indivisibles, [160].

Induction, [34], [222].
mathematical, [195] ff.

Inductiveness, [190], [195] ff.

Inference, [44], [54].

Infinite, [vi], [64], [133], [149].
historically considered, [155] ff.
“true,” [179], [180].
positive theory of, [185] ff.