The fish referred to by our correspondent is also called the Spanish mackerel, it being very common on some parts of the Spanish coast. It belongs to the order Scomberidæ, and is a cousin of our own better known mackerel proper, though a considerably larger fish, and not nearly so good for the table as its beautiful congener. The Spanish differs from the mackerel proper in one very remarkable particular; it has an air bladder which the true mackerel of our shores has not, and yet the latter is one of the readiest and swiftest swimmers, and at all depths, of any fish in the sea. The fact is that the real use of the air bladder in the economy of fish still continues an unresolved and seemingly an unresolvable puzzle. Lovers of living, healthy poetry--healthy as the mountain breeze, and free and sparkling as the mountain stream, and more especially our Celtic friends who have been taught to honour and reverence the "kilted" muse--will be glad to know that Professor Blackie has in preparation the materials of what cannot fail to prove a very interesting volume, consisting of translations of some of the most admired compositions of our modern Gaelic bards. Macintyre's Ben. Dorain, Alasdair Macdonald's Berliun, with many of such lesser popular lyrics, as Am Breacan Wallach, Failte na Mor-Thir, A Bhanarach Dhoun a Cruidh, &c., will thus appear for the first time in a becoming Saxon garb; not--to use the milliner's phrase--too tight a fit, observe, but natural and easy, though "made to measure," and we venture to predict that our English readers, who as yet know them not at all, and our Gaelic friends, who know them well and have long known them, will alike be pleased with the results of the learned Professor's gallant raid into bard-land. The Professor has been visiting us here lately, and we can honestly say that such specimens of his work as he was good enough to read to us--and there are few better readers than Professor Blackie--seemed to us admirably done. His version of Ben. Dorain particularly, which we had an opportunity of hearing twice, and of which we can thus speak most positively, is thoroughly well done; so well, so faithfully, and with such spirit and verve as must delight not only the ordinary reader, but the very "ghost" of the original author--Macintyre himself--if, like the Ossianic departed heroes, he is permitted to know and appreciate sublunary affairs from out the bosom of "his cloud." The Professor translates these Gaelic poems into English verse just as, in our opinion, they should be translated; not too literally, but with all necessary freedom and elbow room, and yet so literally that any one knowing the English version may rest assured that he knows also the original quite as intimately and correctly as it is possible in the circumstances for any mere outsider to know it. Johnson, in his Life of Dryden, referring to the latter's version of the Æneid, &c., has a