Dissolve the yeast in 1/2 cup warm water and stir in half the flour. Let rise for half an hour in a warm draft-free place till it has doubled in size. Punch down and mix in the remaining white flour, the cornmeal, the sugar, butter and eggs. The dough should be very soft; add more warm water, if necessary. Spoon the dough and lightly press onto a buttered cookie sheet. Do not put them too close together. Let them rise in a warm place for about half an hour. Bake in a 200 degrees oven for 15 mins.