Beat the egg whites with the salt until stiff.
Sift the confectioners' sugar with the flour; beat in a tablespoon at a time.
Continue beating until the meringue stands in very stiff peaks.
Fold in the pecans, dates, and vanilla.
Drop by the tablespoonful onto a greased cookie sheet, using your finger as a guide to form into 3-inch lengths.
Bake in a 300° oven about 18 minutes, or until they feel crisp to the touch.
Cool on the cookie sheet.