The practical importance of the house as race-expression begins to be appreciated as and when one realizes the immense difficulty of approaching the kernel of race. I do not refer to its inner essence, its soul--as to that, feeling speaks to us clearly enough and we all know a man of race, a “thoroughbred,” when we see one. But what are the hall-marks for our sense, and above all for our eye, by which we recognize and distinguish races? This is a matter that belongs to the domain of Physiognomic just as surely as the classification of tongues belongs to that of Systematic. But how immense and how varied the material that would be required! How much of it is irretrievably lost by destruction, and how much more by corruption! In the most favourable cases, what we have of prehistoric men is their skeletons, and how much does a skeleton _not_ tell us! Very nearly everything. Prehistoric research in its naïve zeal is ready to deduce the incredible from a jaw-bone or an arm-bone. But think of one of those mass-graves of the War in northern France, in which we _know_ that men of all races, white and coloured, peasants and townsmen, youths and men lie together. If the future had no collateral evidence as to their nature, it would certainly not be enlightened by anthropological research. In other words, immense dramas of race can pass over a land without the investigator of its grave-skeletons obtaining the least hint of the fact. It is the _living_ body that carries nine-tenths of the expression--not the articulation of the parts, but their articulate motions; not the bone of the face, but its mien. And, for that matter, how much potentially interpretable race-expression is actually observed even by the keenest-sensed contemporary? How much we _fail_ to see and to hear! What is it for which--unlike many species of beasts--we lack a sense-organ?