Preheat oven to 350 degrees F (175 degrees C).Grease and flour an 8 inch square pan.
Cream butter or margarine and 1/2 cup sugar until fluffy.Add salt and vanilla.Separate eggs and reserve the whites. Add egg yolks to the sugar mixture; beat until creamy.
Combine 1 1/2 cups flour and baking powder; add alternately with milk to egg yolk mixture.Coat berries with 1 tablespoon flour and add to batter.
In a separate bowl, beat whites until soft peaks form.Add 1/4 cup of sugar, 1 tablespoon at a time, and beat until stiff peaks form.Fold egg whites into batter.Pour into prepared pan.Sprinkle top with remaining 1 tablespoon sugar.
Bake for 50 minutes, or until cake tests done.
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