There is one branch of the "gay science," if I may so call it, which I always expect to find in France, but respecting which I have hitherto been always disappointed: this is in the humble class of itinerant musicians. In Germany they abound; and it not seldom happens that their strains arrest the feet and enchant the ear of the most fastidious. But whenever, in France, I have encountered an ambulant troubadour, I confess I have felt no inclination to linger on my way to listen to him. I do not, however, mean to claim much honour for ourselves on the score of our travelling minstrels. If we fail to pause in listening to those of France, we seldom fail to run whenever our ears are overtaken by our own. Yet still we give strong proof of our love of music, in the more than ordinary strains which may be occasionally heard before every coffee-house in London, when the noise and racket of the morning has given place to the hours of enjoyment. I have heard that the bands of wind instruments which nightly parade through the streets of London receive donations which, taken on an average throughout the year, would be sufficient to support a theatre. This can only proceed from a genuine propensity to being "moved by concord of sweet sounds;" for no fashion, as is the case at our costly operas, leads to it. On the contrary, it is most decidedly mauvais ton to be caught listening to this unexclusive harmony; yet it is encouraged in a degree that clearly indicates the popular feeling. Have I then proved to your satisfaction, as completely as I undoubtedly have to my own, that if without a national music, at least we are not without a national taste for it? LETTER LVI. The Abbé Deguerry.--His eloquence.--Excursion across the water.--Library of Ste. Geneviève.--Copy-book of the Dauphin.--St. Etienne du Mont.--Pantheon. The finest sermon I have heard since I have been in Paris--and, I am almost inclined to think, the finest I ever heard anywhere--was preached yesterday by the Abbé Deguerry at St. Roch. It was a discourse calculated to benefit all Christian souls of every sect and denomination whatever--had no shade of doctrinal allusion in it of any kind, and was just such a sermon as one could wish every soi-disant infidel might be forced to listen to while the eyes of a Christian congregation were fixed upon him. It would do one good to see such a being cower and shrink, in the midst of his impotent and petulant arrogance, to feel how a "plain word could put him down."