The pentadactyl plan of limb, the arrangement of limb with digits as we know it, is, as everyone knows, the regular thing among vertebrates. Evolutionists have maintained that this widespread use of the plan is evidence of a descent from a common ancestor. In this article it is shown that the plan is rather evidence of design. By consideration of many hypothetical alternate plans, it is shown that the arrangement actually found is by far the most satisfactory; and good design consists precisely of making a thing satisfactory for its purpose.