Preheat the oven to 325 degrees. Mix pears with 1 1/2 cup of sugar and let stand. Put butter in 9 x 13 pan and place in the oven until melted. Combine all dry ingredients including the remaining sugar, Mix Well. Beat eggs and add to milk. Slowly combine with dry ingredients. Pour the batter over melted margarine and do not stir. Bake for 1 hour and serve hot or cold.