It was the opinion of the sagacious Tyrwhitt that 'If not' is a mere insertion of the printer's, suggested by 'Is not' in the preceding line. I have, however, little doubt but it should be, as I have printed it, "Is it not a usuring kindness?"
"Exchange it for this one wish, that you had power."
Act V.
Sc. 1.
"To load our purposes, with what they travel for."
Collier's folio reads purses. In that case 'they' should be we.
"When the day serves, before black-corner'd night."