A thousand books have been written about Japan; but among these,--setting aside artistic publications and works of a purely special character,--the really precious volumes will be found to number scarcely a score. This fact is due to the immense difficulty of perceiving and comprehending what underlies the surface of Japanese life. No work fully interpreting that life,--no work picturing Japan within and without, historically and socially, psychologically and ethically,--can be written for at least another fifty years. So vast and intricate the subject that the united labour of a generation of scholars could not exhaust it, and so difficult that the number of scholars willing to devote their time to it must always be small. Even among the Japanese themselves, no scientific knowledge of their own history is yet possible; because the means of obtaining that knowledge have not yet been prepared,--though mountains of material have been collected. The want of any good history upon a modern plan is but one of many discouraging wants. Data for the study of sociology [2] are still inaccessible to the Western investigator. The early state of the family and the clan; the history of the differentiation of classes; the history of the differentiation of political from religious law; the history of restraints, and of their influence upon custom; the history of regulative and cooperative conditions in the development of industry; the history of ethics and aesthetics,--all these and many other matters remain obscure.