Heat oven to 180 C. Grease cookie sheets. Combine flour through salt in a bowl. Mix margarine and sugar in a bowl. Add molasses. Stir in dry ingredients. Drop spoonfuls on cookie sheet, about 10 cm apart. Flatten with floured hands to form rounds about 5 cm in diameter. Bake for 8 - 10 minutes or till spread out and darkening. Allow to cool on racks. Store airtight. Makes 6 dozen cookies.