been such as practically to give him but one choice; still he did choose; he spoke in one way, when there was no physical hinderance to his speaking in another way, when there was no physical compulsion to speak at all. The Gauls need not have changed their own language for Latin; the change was not the result of a physical necessity, but of a number of acts of the will on the part of this and that Gaul. Moral causes directed their choice, and determined that Gaul should become a Latin-speaking land. But whether the skulls of the Gauls should be long or short, whether their hair should be black or yellow, those were points over which the Gauls themselves had no direct control whatever. The study of men's skulls then is a study which is strictly physical, a study of facts over which the will of man has no direct control. The study of men's languages is strictly an historical study, a study of facts over which the will of man has a direct control. It follows therefore from the very nature of the two studies that language cannot be an absolutely certain test of physical descent. A man cannot, under any circumstances, choose his own skull; he may, under some circumstances, choose his own language. He must keep the skull which has been given him by his parents; he cannot, by any process of taking thought, determine what kind of skull he will hand on to his own children. But he may give up the use of the language which he has learned from his parents, and he may determine what language he will teach to his children. The physical characteristics of a race are unchangeable, or are changed only by influences over which the race itself has no direct control. The language which the race speaks may be changed, either by a conscious act of the will or by that power of fashion which is in truth the aggregate of countless unconscious acts of the will. And, as the very nature of the case thus shows that language is no sure test of race, so the facts of recorded history equally prove the same truth. Both individuals and whole nations do in fact often exchange the language of their forefathers for some other language. A man settles in a foreign country. He learns the language of that country; sometimes he forgets the use of his own language. His children may perhaps speak both tongues; if they speak one tongue only, it will be the tongue of the country where they live. In a generation or two all trace of foreign origin will have passed away. Here then language is no test of race. If the great-grandchildren speak the language of their great-grandfathers, it will simply be as they may speak any other foreign language. Here are men who by speech belong to one nation, by actual descent to another. If they lose the physical characteristics of the race to which the original settler belonged, it will be due to inter-marriage, to climate, to some cause altogether independent of language. Every nation will have some adopted children