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While only indirectly related to my subject, it is interesting to recall that there was in this country in the early nineteenth century much opposition to the establishment of common schools for the masses. It was claimed that those who belonged to the working classes did not need to be educated. Our own colleges and universities were originally founded on the old classical-ascetic model, so that the spirit of the medieval period survived in the educational plan of this country. It is only in recent decades that these institutions have begun to depart from the older, formal, classical methods that made education a privilege of the few, the average man being deprived of the advantages of the training that he needed. Because of this the humble millions of men and women who wove and spun, and fed and housed the world were left out of the educational scheme.

The pit being ready and the mescal gathered, the work of cooking commences. Just at daylight the old woman in charge takes her place at the rim of the pit and prays that the cooking may be successful and that the people may be in condition to partake of the food. In igniting the fuel the old-fashioned fire-sticks must be employed; to use matches would bring ill fortune. When the fuel in the pit becomes a blazing mass the women go to prepare breakfast, but are soon at work again gathering brush and grass to cover the mescal. Within four hours the fuel is entirely consumed and the red-hot stones have settled to the bottom of the pit. When it is certain that no fuel remains unburned, as even a small amount of smoke would spoil the quality of the mescal, the head-woman says, "It is good," and with great eagerness her followers begin to fill the pit. There is need for haste in throwing in and covering the mescal, as the steam must be confined to prevent the hot stones from scorching it. The covering consists of alternate layers of green brush, grass, dry leaves, and finally a layer of earth, about six inches in thickness. After forty-eight hours of steaming the seething mass is uncovered and each woman removes her portion.

Darwin himself answered this question, and brought together many excellent examples to show that differences, apparently insignificant because very small, might be of decisive importance for the life of the possessor. But it is by no means enough to bring forward cases of this kind, for the question is not merely whether finished adaptations have selection-value, but whether the first beginnings of these, and whether the small, I might almost say minimal increments, which have led up from these beginnings to the perfect adaptation, have also had selection-value. To this question even one who, like myself, has been for many years a convinced adherent of the theory of selection, can only reply: _We must assume so, but we cannot prove it in any case_. It is not upon demonstrative evidence that we rely when we champion the doctrine of selection as a scientific truth; we base our argument on quite other grounds. Undoubtedly there are many apparently insignificant features, which can nevertheless be shown to be adaptations--for instance, the thickness of the basin-shaped shell of the limpets that live among the breakers on the shore. There can be no doubt that the thickness of these shells, combined with their flat forms, protects the animals from the force of the waves breaking upon them,--but how have they become so thick? What proportion of thickness was sufficient to decide that of two variants of a limpet one should survive, the other be eliminated? We can say nothing more than that we infer from the present state of the shell, that it must have varied in regard to differences in shell-thickness, and that these differences must have had selection-value,--no proof therefore, but an assumption which we must show to be convincing.

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