"If we are satisfied that force or forces are all that exist in the material universe, we are next led to inquire what is force." We are acquainted with two kinds of force--our own will-force, and the forces of nature. Freedom of the will cannot be disproved, for it cannot be shown that there is not one-thousandth of a grain's difference between the force exerted by the body and the force derived from without. "If, therefore, we have traced one force, however minute, to an origin in our will, while we have no knowledge of any other primary cause of force, it does not seem an improbable conclusion that all force may be will-force; and thus, that the whole universe is not merely dependent on, but actually _is_ the _will_ of higher intelligences, or of one Supreme Intelligence." But though Wallace declares "natural selection, as the law of the strongest, inadequate" to account for man's mental and moral development, since the finer feelings and capacities could have been of no use to human beings in the early stages of barbarism, and further maintains that it is also difficult to understand how "feelings developed by one set of actions could be transferred to acts of which the utility was partial, imaginary, or altogether absent," he nevertheless has other passages like the following: "In proportion as physical characteristics become of less importance, mental and moral qualities will have increasing influence on the well-being of the race. Capacity for acting in concert for protection and for the acquisition of food and shelter; sympathy, which leads all in turn to assist each other; the sense of right, which checks depredations upon our fellows; the smaller development of the combative and destructive propensities, self-restraint in present appetites; and that intelligent foresight which prepares for the future, are all qualities that, from their earliest appearance, must have been for the benefit of each community, and would, therefore, have become the subjects of natural selection. For it is evident that such qualities would be for the well-being of man; would guard him against external enemies, against internal dissensions, and against the effects of inclement seasons and impending famine, more surely than could any merely physical modification. Tribes in which such mental and moral qualities were predominant would therefore have an advantage over other tribes in which they were less developed, would live and maintain their numbers, while the others would decrease and finally succumb." "From the time, therefore, when the social and sympathetic feelings came into active operation, and the intellectual and moral faculties became fairly developed, man would cease to be influenced by natural selection in his physical form and structure. As an animal, he would remain almost stationary, the changes of the surrounding universe ceasing to produce in him that powerful modifying effect which they exercise over other parts of the organic world. But