This continuity, congruity, or coherence of the group, is of an immaterial character. It is a matter of knowledge, usage, habits of life and habits of thought, not a matter of mechanical continuity or contact, or even of consanguinity. Wherever a human community is met with, as, _e.g._, among any of the peoples of the lower cultures, it is found in possession of something in the way of a body of technological knowledge,--knowledge serviceable and requisite to the quest of a livelihood, comprising at least such elementary acquirements as language, the use of fire, of a cutting edge, of a pointed stick, of some tool for piercing, of some form of cord, thong, or fiber, together with some skill in the making of knots and lashings. Cooerdinate with this knowledge of ways and means, there is also uniformly present some matter-of-fact knowledge of the physical behavior of the materials with which men have to deal in the quest of a livelihood, beyond what any one individual has learned or can learn by his own experience alone. This information and proficiency in the ways and means of life vests in the group at large; and, apart from accretions borrowed from other groups, it is the product of the given group, though not produced by any single generation. It may be called the immaterial equipment, or, by a license of speech, the intangible assets[2] of the community; and, in the early days at least, this is far and away the most important and consequential category of the community's assets or equipment. Without access to such a common stock of immaterial equipment no individual and no fraction of the community can make a living, much less make an advance. Such a stock of knowledge and practice is perhaps held loosely and informally; but it is held as a common stock, pervasively, by the group as a body, in its corporate capacity, as one might say; and it is transmitted and augmented in and by the group, however loose and haphazard the transmission may be conceived to be, not by individuals and in single lines of inheritance.