Preheat oven to 425 degrees F (220 degrees C). Mix sugar, cornstarch, salt, and cinnamon, and sprinkle over blueberries. Line pie dish with one pie crust. Pour berry mixture into the crust, and dot with butter. Cut remaining pastry into 1/2 - 3/4 inch wide strips, and make lattice top. Crimp and flute edges.
Potassium. The name is derived from the english word potash. The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali. Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart.
Potassium is a chemical element with symbol K (derived from Neo-Latin, kalium) and atomic number 19. It was first isolated from potash, the ashes of plants, from which its name derives. In the periodic table, potassium is one of the alkali metals.