To attempt a closer definition of a good letter than has been given would be a fruitless, as well as difficult task. "Complete letter-writers" are chiefly useful for the formulas--notes of invitation, answers to them, and the like--which they contain, and for their lessons in punctuation, spelling, and criticism. Their efforts to instruct upon other points are and must be worse than useless, because their precepts cramp without inspiring. A few good examples are more valuable, but a little practice is worth them all. Letter-writing is, after all, a _pas seul_, as it were; the novice has no partner to teach him manners, or the figures of the dance, or to set his wits astir. By effort, and through numerous failures, he must teach himself. The difficulties of the medium between him and his distant friend, who is generally in a similar predicament, must be surmounted. Gradually stiffness gives place to ease of composition, roughness to elegance, awkwardness to grace and tact, until his letters at length come to represent his mood, and to interest, if not to delight, his correspondent. A rigid adherence to times and places and ceremonial retards this process of growth and advance, which is slow enough, at best. But, although most correspondence is, from want of truthfulness, thoughtfulness, life, good judgment, and good breeding, very unsatisfactory, it cannot be denied that many good letters are written every day. Between lovers, parents and children, real and hearty friends, they pass. Young men on the threshold of life, while discussing together the grave questions then encountered, write them. Women, before their time to love and to be loved has come, or after it is passed,--women, who, disappointed in the great hope of every woman's life, turn to one another for support and shelter,--are sending them by every post. Mr. De Quincey somewhere says, that in the letters of English women, almost alone, survive the pure and racy idioms of the language; and the German Wolf is said to have asserted, that in corresponding with his betrothed he learnt the mysteries of style. Such letters as these are worth one's reading, because the utterance is genuine and genial. The writers feel and express in every line an interest in what they are writing, and do not recognize the conventional rules which obtain where people rely less upon inspirations from within than upon fixed general maxims for their guidance. As in the drawing-room the gentleman or lady behaves naturally, and not according to the dancing-master, so in their correspondence the best-bred people act from nature, and not from instruction. * * * * * THE CATACOMBS OF ROME. [Continued.] Novit etiam pictura tacens in parietibus loqni. ST. GREGORY OF NYSSA. IV.