Adriatic Sea and lock up the Austrian ships in Pola. The Alpine Frontier By G.H. Perris. [This article appeared originally in The London Daily Chronicle of May 29, 1915.] We have all learned a good deal of French, Russian, and Austrian geography in the last ten months; and, in the same sad school, we shall now become better acquainted with the region of mountain and plain which, through and for 140 miles east of Lake Garda, is the Austro-Italian borderland, and with the northeastern coast of the Adriatic, where there will be important side issues. There is this great difference, among others, between the Adriatic and the Alpine military problems: On the one side, the Germanic powers can now only assume the defensive; on the other, they can, and probably will, attempt the invasion of provinces dear not only to Italians, for their homes and a splendid galaxy of historic associations, but to cultivated minds throughout the world for treasures of art abounding even in the humblest towns and villages. The irregularity of this northern frontier is the product of an unhappy history; it does not follow the line of the mountain summits or any other natural feature, and still less is it a limit marked by race or language. A glance at the map shows its salient characteristic--the piece of the Austrian Tyrol, from forty to sixty miles wide, which is thrust southward toward the great plain of Lombardy and Venetia, and toward the four provincial capitals, Brescia, Verona, Vicenza, and Belluno. The Trentino--as it is called, after the very ancient city of Trent, once the chief town of Tyrol, now a market centre dignified by many towers and poverty-stricken palaces and castles--is thoroughly Italian; but it still gathers much of its importance, as it has done ever since Roman times, from the fact that the best and oldest road from Germany and West Austria over the Alps runs through it to Verona. For nearly half a century one of the grandest of mountain railways has followed this olden track of conquest and pilgrimage, from Innsbruck over the Brenner Pass, through Botzen, and down the Adige Valley. More recently a branch line has been built which runs from Trent southeastward to Padua and Venice.