It was a curiously mingled scene. The ceremonies of the altar were going on in all their mysterious splendor. The waving of censers, the kneeling and rising of the gorgeously clad priests, accompanied simultaneously by the pealing of solemn music from the different organs--the countless lights burning upon the altar, and, ranged within the paling, a semicircle of the duke's grenadiers, standing motionless, with their arms presented, while the sentinel paced to and fro, and all kneeling, and grounding arms at the tinkle of the slight bell--were the materials for the back-ground of the picture. In the immense area of the church stood perhaps, four thousand people, one third of whom, doubtless, came to worship. Those who did and those who did not, dropped alike upon the marble pavement at the sound of the bell; and then, as I was heretic enough to stand, I had full opportunity for observing both devotion and intrigue. The latter was amusingly managed. Almost all the pretty and young women were accompanied by an ostensible duenna, and the methods of eluding their vigilance in communication were various. I had detected under a _blond_ wig, in entering, the young ambassador of a foreign court, who being _cavaliere servente_ to one of the most beautiful women in Florence, certainly had no right to the amusement of the hour. We had been carried up the church in the same tide, and when the whole crowd were prostrate, I found him just beyond me, slipping a card into the shoe of an uncommonly pretty girl kneeling before him. She was attended by both father and mother apparently, but as she gave no sign of surprise, except stealing an almost imperceptible glance behind her, I presumed she was not offended. I passed an hour, perhaps, in amused observation of similar matters, most of which could not be well described on paper. It is enough to say, that I do not think more dissolute circumstances accompanied the worship of Venus in the most defiled of heathen temples. LETTER L. FLORENCE--VISIT TO THE CHURCH OF SAN GAETANO--PENITENTIAL PROCESSIONS--THE REFUGEE CARLISTS--THE MIRACLE OF RAIN--CHURCH OF THE ANNUNCIATA--TOMB OF GIOVANNI DI BOLOGNA--MASTERPIECE OF ANDREA DEL SARTO, ETC., ETC.