I mentioned just now the importance of moral questions, and the necessity of grappling with them. There is another order of considerations quite opposed to that one, which has in general been too much neglected; I mean the physical condition of society, the physical changes introduced into men's modes of existence by a new occurrence, by a revolution in the social state. Sufficient attention has not always been paid to this matter; inquiry has not been sufficiently directed to the modifications these great crises in the world have produced in the material existence of men and in their relations. These modifications have more influence upon the entirety of society than is usually imagined. Every one knows how much the question of the influence of climate has been discussed, and the great importance attached to it by Montesquieu. If the direct influence of climate upon men be mooted, it is perhaps not so extensive as is supposed; at all events, the appreciation is vague and difficult. But the indirect influence of climate--that which results, for example, from the fact, that in a hot country men live in the open air, whilst in cold countries they shut themselves up in habitations, and that they support themselves in the two extremes after different modes--becomes of extreme importance, since the mere variation in physical life has a powerful operation on civilisation. Now every great revolution brings with it modifications of the sort I have mentioned into the social state, and it is incumbent upon us to give them great attention. {75} The establishment of the feudal system produced one of these changes of grave import; it completely altered the distribution of the population on the face of the land. Previously, the masters of the territory, the conquering population, had lived in masses more or less numerous, either sedentary in the interior of towns, or roving in bands over the country. By the feudal system, these men came to live isolated, each in his habitation, at great distances from each other. This change of course exercised material influence upon the character and course of civilisation. The social preponderance, the government of society, passed at once from the towns to the country; private property necessarily became of greater importance than public property, and in the same manner public life was absorbed in private life. Such was the first effect, a purely physical effect, of the triumph of the feudal society. The farther we investigate it, the more will the consequences of this single fact be unveiled. In order to get more unequivocally at the part borne by this system in the history of civilisation, let us first of all take it in its most simple phase, in its primitive and fundamental element; let us contemplate a possessor of a fief in his domain, and inquire what becomes of all those who compose the petty society around him.