The substitution of flint, stone, horn, and wood, in the absence of metal weapons and implements, must be abundantly familiar to all, in the customs of society when met with in a rude and primitive condition. The Fins and Esquimaux, the African bushmen, and the natives of such of the Polynesian Islands as are rarely visited by Europeans, still construct knives and arrow-heads of flint or fish-bone, and supply themselves with wooden clubs and stone adzes and hammers, with little consciousness of imperfection or deficiency in such appliances. Examples of such a state of arts and human skill might be multiplied from the most dissimilar sources. It seems, as has been already remarked, to be a stage through which all nations have passed, not without each developing a sufficient individuality to render their arts well worthy of investigation by their descendants. To this primitive era of history we refer under the name of THE STONE PERIOD. In this state were the Scottish, and indeed the whole British aborigines, at an era much more remote than chronologists have been willing to assign for the occupation of the island by a human population, and for a period the duration of which we are also able in some degree to test. There is one certain point in this inquiry into primitive arts which the British antiquary possesses over all others, and from whence he can start without fear of error, though I am not aware that its importance in this view has heretofore been noted. From our insular position it is unquestionable that the first colonist of the British Isles must have been able to construct some kind of boat, and have possessed sufficient knowledge of navigation to steer his course through the open sea. Contrasting the aboriginal arts to which we have referred with the appliances of later navigators, it seems only reasonable to conclude that the bark of the primeval Columbus, who led the way from the continent of Europe to the untrodden wilds of Britain, differed no less from the caravel of the bold Genoese, than that did from the British ship that now follows in its course. Can we recover the history of such primitive caravel? It seems not improbable that we may. Time has dealt kindly with the frail fleets of the aboriginal Britons, and kept in store some curious records of them, not doubting but these would at length be inquired for.