Paper Bag Apple Pie

1 unbaked pie crust for a 9 inch pie
8 medium apples, peeled, cored and sliced
1/2 cup white sugar
2 tablespoons all-purpose flour
1/2 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
2 tablespoons lemon juice
1/2 cup white sugar
1/2 cup all-purpose flour
1/2 cup butter or margarine
                   
1. Mix 1/2 cup sugar, 2 tablespoons flour, cinnamon, and
   nutmeg. Mix this with apples and pour into pie shell.
   Sprinkle lemon juice over top. 
2. To Make the Top Crust: Mix 1/2 cup sugar and 1/2 cup
   flour, then cut in butter. Sprinkle over pie. 
3. Slide pie into a large, heavy supermarket paper bag. fold
   open end twice and fasten with paper clips. Place on a
   baking sheet. 
4. Bake at 425 degrees F for 1 hour. Remove from oven, split
   bag open and cool pie on wire rack. DO NOT open bag while
   baking!