A progression in arithmetical progression : to the speedy suming up of any totals of roots, squares, or cubes as effectually as now is used only in numbers, with various uses thereof. With some things very remarkable in that mystical number, 666. Also affording ease in the extracting of cubick roots; and the framing of cubes to imperfect roots. By J.W. of Brandon in Com'Warwick, gent.