Partly for reasons of convenience, and partly because there is less chance of misapprehending the sense of phenomena that are familiar to all men, the data employed to illustrate or enforce the argument have by preference been drawn from everyday life, by direct observation or through common notoriety, rather than from more recondite sources at a farther remove. It is hoped that no one will find his sense of literary or scientific fitness offended by this recourse to homely facts, or by what may at times appear to be a callous freedom in handling vulgar phenomena or phenomena whose intimate place in men’s life has sometimes shielded them from the impact of economic discussion.
Such premises and corroborative evidence as are drawn from remoter sources, as well as whatever articles of theory or inference are borrowed from ethnological science, are also of the more familiar and accessible kind and should be readily traceable to their source by fairly well-read persons. The usage of citing sources and authorities has therefore not been observed. Likewise the few quotations that have been introduced, chiefly by way of illustration, are also such as will commonly be recognised with sufficient facility without the guidance of citation.
