In now carrying my study of mental evolution into the province of human psychology, it is desirable that I should say a few words to indicate the scope and intention of this the major portion of my work. For it is evident that Mental Evolution in Man is a subject comprehending so enormous a field that, unless some lines of limitation are drawn within which its discussion is to be confined, no one writer could presume to deal with it The lines, then, which I have laid down for my own guidance are these. My object is to seek for the principles and causes of mental evolution in man, first as regards the origin of human faculty, and next as regards the several main branches into which faculties distinctively human afterwards ramified and developed. In order as far as possible to gain this object, it has appeared to me desirable to take large or general views, both of the main trunk itself, and also of its sundry branches. Therefore I have throughout avoided the temptation of following any of the branches into their smaller ramifications, or of going into the details of progressive development These, I have felt, are matters to be dealt with by others who are severally better qualified for the task, whether their special studies have reference to language, archaeology, technicology, science, literature, art, politics, morals, or religion.