Two preliminary processes indeed there are which seem inscrutable. There was some strange preliminary process by which the main races of men were formed; they began to exist very early, and except by intermixture no new ones have been formed since. It was a process singularly active in early ages, and singularly quiescent in later ages. Such differences as exist between the Aryan, the Turanian, the negro, the red man, and the Australian, are differences greater--altogether than any causes now active are capable of creating in present men, at least in any way explicable by us. And there is, therefore, a strong presumption that (as great authorities now hold) these differences were created before the nature of men, especially before the mind and the adaptive nature of men had taken their existing constitution. And a second condition precedent of civilisation seems, at least to me, to have been equally inherited, if the doctrine of evolution be true, from some previous state or condition. I at least find it difficult to conceive of men, at all like the present men, unless existing in something like families, that is, in groups avowedly connected, at least on the mother's side, and probably always with a vestige of connection, more or less, on the father's side, and unless these groups were like many animals, gregarious, tinder a leader more or less fixed. It is almost beyond imagination how man, as we know man, could by any sort of process have gained this step in civilisation. And it is a great advantage, to say the least of it, in the evolution theory that it enables us to remit this difficulty to a pre-existing period in nature, where other instincts and powers than our present ones may perhaps have come into play, and where our imagination can hardly travel. At any rate, for the present I may assume these two steps in human progress made, and these two conditions realized.