38 THE YOUTH’S CABINET. nomenon taking place near Porto Ca- bello. In all parts the disturbance was more violent in the cordilleras of gneiss and mica-slate, or immediately at their base, than in the plains.— Selected. ee | eee The Bad Spectacles. A certain artist—I forget his name— Had got for making spectacles a fame, ' Or “helps to read,” as, when they first were sold, Was writ, upon his glaring sign, in gold ; And, for all uses to be had from glass, His were allowed by readers to surpass. ‘There came a man into the shop one day— “ Are you the spectacle-contriver, pray ?” “Yes, sir,” said he, “I can in that affair Contrive to please you, if you want a pair.” “Can you /!—Pray do, then.”—So, at first he chose To place a youngish pair upon his nose, ‘And book produced, to see how they would fit; ‘Asked how he liked them.—* Like them! not a bit.” “Then, sir, I fancy, if you please to try, These in my hand will better suit your eye.” “No, but they don’t.”—“ Well, come, sir, if you please, Here is another sort—we'll e’en try these ; Still somewhat more they magnify the letter ; Now, sir ?’—“ Why, now, I’m not a whit the better.” _ “W ell, here, take these, which magnify still more: How do they fit ?”—* Like all the rest before.” In short, they tried a whole assortment through ; But all in vain, for none of them would do. The operator, much surprised to find So odd a case, thought sure the man is blind. “ What sort of eyes can you have got?” said he. “Why, very good ones, friend, as you may see.” “Yes, I perceive the clearness of the ball— Pray, let me ask you, can you read at all?” “ No, you great blockhead ! if I could, what need Of paying you for any ‘ helps to read?’ ” And so he left the maker in a heat, Resolved to post him for an arrant cheat. Selected. Floating Islands. HERE are various examples of float- ing islands. Those of the lake Gerdau in Prussia are said to af- ford sufficient pasturage for a hundred head of cattle, which have ac- tually been found grazing en them, and noble elms grow upon one in the laké& Kolk, in Osnabriick. These islands have been formed by the very gradual in- crease of vegetable matter, reeds from the marshes and roots of trees, upon which the waters have deposited fine sand and gravel, held in suspension. The great raft near the mouth of the Mississippi is a production of an analo- gous kind. This is composed of the wood annually drifted down that river and its tributaries, consisting of the mag- nificent trees growing upon their banks, which fall into the waters, owing to the floods undermining their foundations and loosening their roots. Arrested by some obstruction in the river, a mass of timber has thus accumulated, and become con- solidated by the interlacing of weeds and the deposite of alluvium, so as to form what is called ‘the raft,” the di- mensions of which in 1816 amounted to a length of ten miles, a width of two hundred and twenty yards, and a depth of eight feet. This is an island afloat in the bosom of the waters, having exter- nally the appearance of solid land, for green bushes and a variety of beautiful flowers bloom upon its surface. The age of the raft, at the time when the preceding dimensions were given, is sup- posed to have been not more than thirty- eight years, from which some idea may be formed of the quantity of drift-wood borne down the Mississippi.