It has been said, moreover, that the mode of construction of the dolmens, and we hate ourselves made the same remark, is far from being the same everywhere. The dolmens of Brittany have sepulchral chambers with long passages leading to them; those of the neighborhood of Paris have wide covered avenues with a very short entrance lobby. In the south of France we see nothing but rectangular compartments formed of four or five colossal stones. All this is true enough; but if we examine our old cathedrals of comparatively modern date, the common origin of which is never disputed, we note differences no less remarkable. On the other hand it is urged that if megalithic monuments were all erected by one race, the objects they contain would certainly resemble each other to a great extent. But even this is not the case. The hatchets so numerous in the west of France are rare in the south; those from the Algerian monuments are always of coarse workmanship, whilst those of Denmark are highly finished. We might multiply instances, but as a matter of fact do we not see the same kind of thing in the present day, in spite of our railways and other modes of rapid communication, and the perpetual intermarrying of modern peoples? Compare the ornaments of Normandy with those of the Basque provinces, those of Brittany with those of Burgundy, and surely the differences between them will be found to be as great as we note in the weapons and ornaments of the builders of the megalithic monuments. To sum up: according to the opinion of many eminent savants, numerous races have been in the habit of raising megalithic monuments, the form of which varies _ad infinitum_ according to the genius or the circumstances of each race, and according to the nature of the soil or of the material at the disposal of the builders. All, however, belong to one general type, and bear witness to one general influence, which extended throughout the whole world at a certain epoch. M. Cazalis de Fondouce, from whom I borrow these last observations, would probably find it as difficult to say how a general influence was extended to races of which he denies the common parentage, and the relations and contemporaneity he can but guess at, as I myself should—granting the contrary hypothesis—to explain how a people could wander about the world in incessant migrations without modifying its own habits or communicating to others its rites and its mode of erecting monuments.