This opens to our view a practically immeasurable expanse of relations and modes under which the process of the external and relative world is determined. For in the first place we are confronted at once with the bare facts of external Nature such as particular locality, situation, whether habitable or not, temporal condition, the nature of the prevailing climate, whether in our earth's northern or southern hemispheres, and in fact in whatever direction we advance we have a fresh picture before us. Moreover, external Nature is made use of by man to satisfy his own needs and purposes; and all the ways under which he converts her to that use, that is to say the adroitness with which he discovers and then equips himself with tools and a home to live in, with weapons, with seats to recline upon, carriages to ride in, nay, all that the art of cooking may bring with it for his food, the entire apparatus of his luxury no less than his comfort, all this and much more fall within the limits of our inquiry. Add to this the further and yet more important consideration that every man lives within a comprehensive and equally real world of spiritual relations, which itself, too, presents to his view all the different modes under which command and submission is maintained, that is to say the family, blood-relationship, property, country and town life, the _cultus_ of religion, the organization of defence and offence, civic and political associations, private society, in short every conceivable form under which ethical customs and usages are organized in the institutions and permanent activities which contribute to the actual environment of human existence.