In large bowl, beat butter and 1 cup sugar just until blended at low speed. increase speed to medium and beat until light an fluffy, about 5 minutes.
Combine flour, baking powder and salt in medium bowl. Reduce speed to low, add eggs, one at a time, beating after each addition until well blended-- alternately add flour mixture and milk, mixing just until blended.
Gently stir in blueberries. Spoon batter into 9” x 5” loaf pan.
Bake loaf for 1 hour and 5 minutes. Cool loaf on rack for 10 minutes and remove from pan.
In small bowl, combine 1/3 cup sugar and 1/4 cup lemon juice. Prick top and sides of loaf with skewer in many places and brush mixture on with pastry brush.