An approved antidote or cordiall medicine, that by Gods favour cureth the pestilentiall feaver, or plague [electronic resource] : with other contagious agues or feavers, beginning either hot or cold, and that at once taking, or at the most at twice, and hath no tast nor smel: and the quantity at one time to be taken is but 8 graines, and the vertue therof, will not decay in 40 yeares, and it is to be used as followeth.