It is impossible to state the nature or the extent of the social organization among these people, but that there must have been something of the sort there can be no doubt. It seems equally plausible that there could have been no recognition of law in the lives of these passionate savages, excepting as the will of some more than ordinarily forceful warrior was for the time so recognized. An association of this kind admitted of the sloughing of the groups whenever a difference of inclination or of interest suggested such a course. Promiscuity undoubtedly remained the characteristic form of the relation of the sexes, the conditions of life admitting of no more enduring relations. The culture of the peoples of the river-drift and of the caves signified little in British civilization, as these shadowy tribes passed completely out of view. For a period of time that could be expressed only in the term of vague geological computation, the country remained devoid of inhabitants. Meantime, changes were wrought in Britain's physical features. The land became insular, although the subsidence that gave rise to the English Channel was not yet complete. In an indirect way, the earliest peoples may be said to have passed on the elements of their culture; for, while there was a lapse in the continuity of social development, the Neolithic races that are next met with in Britain became the inheritors of the culture of the ruder hunter stages of society represented by the river-drift and cave peoples. The social grade of the Neolithic races was a great advance over that of the peoples last considered. Instead of bands of nomadic wanderers, we find a pastoral people whose migrations were doubtless periodical and made only in search of new pastures. Hunting did not form an important part of their lives, for their food was supplied by the flesh of domesticated animals and the cereals that they raised for their own needs and, in the winter season, for those of their stock. Although caves continued to be used to some extent for dwellings, they were not characteristic of the civilization of the times. Man had become a home builder. The evolution from the cave dwellings is seen in the style of houses that were first constructed. They consisted of pits dug to a depth of seven to ten feet, and about seven feet wide at the base. These pits were roofed over with a sort of thatch, filled in with imperfectly burnt clay. They were built singly and in groups, and were sometimes connected by a system of underground passages. Access was had to these dwellings by a slanting, shaftlike entrance. A pit village was usually stockaded to protect it against the assaults of foes. Outside it were the arable lands and the common pasture lands for the sheep and goats; enclosing these, the forest stretched out in all directions.