I.i.10 (396,5) Fair is foul, and foul is fair] I believe the meaning is, that to us, perverse and malignant as we are, fair is foul, and foul is fair.
I.ii.14 (398,9) And Fortune, on his damned quarry smiling] Thus the old copy; but I am inclined to read quarrel. Quarrel was formerly used for cause, or for the occasion of a quarrel, and is to be found in that sense in Hollingshed's account of the story of Macbeth, who, upon the creation of the prince of Cumberland, thought, says the historian, that he had a just quarrel, to endeavour after the crown. The sense therefore is, Fortune smiling on his excrable cause, &c. This is followed by Dr. Warburten. (see 1765, VI, 373, 4).
I.ii.28 (400,4) Discomfort swells] Discomfort the natural opposite to comfort. Well'd, for flawed, was an emendation. The common copies have, discomfort swells.
I.ii.37 (400,5) As cannons overcharg'd with double cracks,
So they
Doubly redoubled strokes upon the foe]
Mr. Theobald has endeavoured to improve the sense of this passage by altering the punctuation thus:
—they were
As cannons overcharg'd, with double cracks
So they redoubled strokes—