Note 11 — WINDSOR FOREST.
Reading edition
Originally thus:
Why should I sing our better suns or air, Whose vital draughts prevent the leech's care, While through fresh fields th' enlivening odours breathe, Or spread with vernal blooms the purple heath?—Pope.
The first couplet of the lines in Pope's note, was from Dryden's epistle to his kinsman:
He scapes the best, who, nature to repair, Draws physic from the fields, in draughts of vital air.