Beat egg whites until stiff. Add about ¼ cup of the sugar to keep them stiff.
In another bowl, add shortening, salt and vanilla and mix this.
Add the egg yolks and beat with mixer.
Add the remaining sugar gradually.
Add the flour and the remaining dry ingredients alternately with the milk.
Fold in the beaten egg whites and then carefully fold in the blueberries which have been mixed with a little flour.
Pour into your pan that has been prepared greased and floured cake pan.
Bake at 350 degrees for about 50 to 60 minutes.
Sprinkle the top of the cake with granulated sugar before putting in oven.
