"That the standard measure of capacity for coals, lime, culm, fish, potatoes, or fruit, and all other goods, and things commonly sold by heaped measure, shall be the aforesaid bushel, containing 80 lbs. avoirdupois of water, as aforesaid, the same being made round with a plane and even bottom, and being 19 1/2 inches from outside to outside of such standard measure as aforesaid:" and goods thus sold by heaped measure shall be heaped "in the form of a cone, such cone to be of the height of at least six inches, the outside of the bushel to be the extremity of the base of such cone;" three such bushels shall be a sack, and twelve such sacks shall be a chaldron.