Rhubarb Pie

4 1/2 Cups rhubarb, chopped
1 1/3 Cups sugar
6 T flour
1 T butter
1 recipe pastry for a 9 inch double crust pie

Cinnamon

Combine sugar and flour. Sprinkle 1/4 cup of it over pastry in pie plate. Top with rhubarb. Sprinkle with remaining sugar and flour, reserving 1 tablespoon. Dot with small pieces of butter. Cover with top crust. Add a dash of cinnamon to remaining sugar and flour mixture.  Brush crust with water and sprinkle with remaining sugar/flour mixture.  Bake for 15 minutes in preheated 450 degree oven. Reduce oven temperature to 350 degrees, and bake for 40 to 45 minutes longer.