The strongest medicines lose their healing power, 310
And even the surest poisons theirs to kill.
Let those who from the frozen Arctos reach
Parch’d Mauritania, or the sultry West,
Or the wide flood that waters Indostan,
Plunge thrice a day, and in the tepid wave 315
Untwist their stubborn pores; that full and free
Th’ evaporation thro’ the softned skin
May bear proportion to the swelling blood.
So shall they ’scape the fever’s rapid flames;