It is only in very recent times that the French have turned their attention to the study of their Rude-Stone Monuments; but since they have done so, it has been in so systematic and scientific a manner that, had it been continued a few years longer, little would have been left to be desired by the students of that class of antiquities in France. War and revolution, however, intervened just as the results of these labours were about to be given to the world, and how long we may now have to wait for them, no one can tell. The Musée de St.-Germain was far from being complete in July last, and only the first parts of the great 'Dictionnaire des Antiquités celtiques' had been published at that time. We can now hardly hope that the necessary expenditure will be continued which is indispensable to complete the former, and it is difficult to foresee in what manner the materials collected for the dictionary can now be utilised. Even when much further advanced towards completion, it is hardly to be expected that the museums of St.-Germain and Vannes can rival the royal collections at Copenhagen; and if the French had confined themselves only to collecting, they would not have advanced our knowledge very much; but, while doing this, they have also gathered statistical information, and have been mapping and describing, so that our knowledge of their monuments is much more complete than of those of the Danes. To borrow a simile from kindred sciences, it is as if the Danes had attended exclusively to the mineralogy of the subject: collecting specimens from all parts, and arranging them according to their similarities or affinities, wholly irrespective of the localities from which they came. The French, on the other hand, have founded a science similar to that of geology on their knowledge of the minerals; they have carefully noted the distribution of the various classes of monuments, and, so far as possible, ascertained their relative superposition. The first is, no doubt, a most useful process, and one that must to a certain extent precede the other; but unless we map the various rocks on the surface and ascertain their stratification, it hardly helps us in studying the formation or history of our globe.