For three years past there has been much rumor over Germany, of a strange affair going on in the remote Austrian quarter, down in Salzburg and its fabulous Tyrolese valleys. Salzburg, city and territory, has an Archbishop, not theoretically Austrian, but sovereign Prince so styled; it is from him and his orthodoxies, and pranks with his sovereign crosier, that the noise originates. Strange rumor of a body of the population discovered to be Protestant among the remote Mountains, and getting miserably ill-used, by the Right Reverend Father in those parts. Which rumor, of a singular, romantic, religious interest for the general Protestant world, proves to be but too well founded. It has come forth in the form of practical complaint to the CORPUS EVANGELICORUM at the Diet, without result from the CORPUS; complaint to various persons;--in fine, to his Majesty Friedrich Wilhelm, WITH result. With result at last; actual "Emigration of the Salzburgers:" and Germany--in these very days while the Crown-Prince is at Berlin betrothing himself, and Franz of Lorraine witnessing the EXERCITIA and wonders there--sees a singular phenomenon of a touching idyllic nature going on; and has not yet quite forgotten it in our days. Salzburg Emigration was all in motion, flowing steadily onwards, by various routes, towards Berlin, at the time the Betrothal took place; and seven weeks after that event, when the Crown-Prince had gone to Ruppin, and again could only hear of it, the First Instalment of Emigrants arrived bodily at the Gates of Berlin, "30th April, at four in the afternoon;" Majesty himself, and all the world going out to witness it, with something of a poetic: almost of a psalmist feeling, as well as with a practical on the part of his Majesty. First Instalment this; copiously followed by others, all that year; and flowing on, in smaller rills and drippings, for several years more, till it got completed. A notable phenomenon, full of lively picturesque and other interest to Brandenburg and Germany;--which was not forgotten by the Crown-Prince in coming years, as we shall transiently find; nay which all Germany still remembers, and even occasionally sings. Of which this is in brief the history.