Before going further, we may here state our assumption that, when our ancestor had arrived at this crisis in his life, a crisis involving the vast psychological step in advance implied in the development of society, and the intelligence necessary for the evolution of the law in its regulation, he was already somewhat more than ape. The animal stage as forming part of the ladder of ascent from brute to man would be marked by degrees of progression, each a step further removed from the original type. These very earliest steps we indeed propose to examine later in detail, for the present we will suppose they have been taken, and that the influence of environment, under certain hypothetic conditions, to be also detailed hereafter, has fostered physical modifications towards the human type such as we found in the matter of rut. But in nature the relation is very close between the physical and the mental qualities. The advance in one would possibly lead to a corresponding development of the other. Each is the necessary complement of each. For instance, as Mr. Darwin has pointed out, while the lower extremities become more and more used for progression alone, so the upper, thus left free, would be specialised as prehensile organs, so becoming both valet and tutor to the nascent brain. To push our metaphor to an extreme, we may say that when Homo Alalus trod the new path, it was already as a biped in an upright attitude, thus leaving at least his hand free to point it out to others, for as yet his tongue, at least by the hypothesis, was inarticulate.