We have scientific writers of several kinds and their number is continually increasing there is no harm in that, but their studies art mainly directed to form theorists capable o ordering workmen, but unable to put thei: own hands to the work. Banish to their coun try seats the most celebrated engineers, anc they will be as embarrassed to perform th( smallest thing for themselves, as our statesmen, magistrates, professors, poets, painters and wealthy merchants. If a lamp leaks a coffee-pot is broken, a screw lost, a lock damaged, or a chair on three legs—and lor i thousand other petty trifles—they must senc to the neighboring town. If it is an emergency, a messenger on horseback must be dispatched, with perhaps a kettle round his neck and a cdliple of watering-pots in his hand there is no poor Robinson Crusoe to be founc in these oases of luxury and indigence. Then is, therefore, wanting a class of men who hav( a slight knowledge, not enough to manufacture but sufficient to repair every thing,—whc can place a little solder on this place, a little glue on that; clean their employer's gun o] watch; forge a bolt, take down a stove, bore a hole and fit in a screw, patch up a valuable piece 01 porcelain, and adjust a hand organ who can give one blow with a hammer and another on a flute; bend a piece of wire, anc tie up a bell rope ; saw off the end of a plank plane a little off the door, make a shovel-full of mortar, mix up a little plaster, lay a coating of color on a wall, and take out a spot oi it on your coat,—in short, who can frame a picture, prevent a chimney from smoking, varnish a piece of furniture, and, in case of necessity, put a shoe on a horse, &c. &c. In our society of imbeciles, each of these things requires a particular workman, who must be sent for several times, and who only troubles himself with what concerns his own trade and nothing else. What a heap of bills and accounts at the end of the year—they are never done coming in. While the workmen whisper to one another, *' what an awkward helpless set of fellows these rich men are-obliged to run after us to open a trunk, splice a rope, make a hole in a strap, join a hoop, put a pin in the wheel of a child's coach, and a tail to the kite. All those great men who make laws, and do not know how to work with their ten fingers, can teach us nothing. I have seen some who do not know the difference between tin and lead—between gum ara-bic and gum lac ; they take iron pyrites for silver ore, oats for wheat, and do not know how the bread they eat is made. I have heard of one, who, wishing to instruct his son, attached to an embassy, said to him, ' You see that big tree, that is a poplar, pine boards are made out of it.' And yet they always have a book in their hand, and send their children to school up to twenty years of age. What in heaven's name can they learn there ? They must be very thick-headed not to know as much as we who have never learnt anything. It is not for want ot time, for they do not know what to do with themselves all day." These are the very natural expressions of work-people among themselves; but let us return to our " Useful Man." Is it possible that a man of this kind would not be valuable on a gentleman's country-seat—that he would not be sought after and paid the same as a good cook. Well, any young countryman that knows how to read, write, and cypher would require, at the utmost, two years at a special school to learn to do all the repairing that we have mentioned, and much more. Five days passed in the workshop of a turner, cabinetmaker, smith, locksmith, tinman, glazier p) umber, sadler, frame maker, &c., would be sufficient, with a few explanations, and receipts written in a memorandum book to enable him to mend any thing belonging to the above trades. A fortnight passed with a clock-maker, gunsmith, and lamp maker, would give him an insight into the fabrication of arms, watches, lamps, locks, and principal tools of each of these trades. Some lessons of common drawing, given at school between the visits to the workshops, would complete the education of the useful man. A workshop could be set apart lor him in the house; the tools would not be expensive—a small joiner's bench, a vise, a few files, pincers, and chisels, a plane, hammer, saw, and soldering iron, some screw taps, a small anvil, ditto furnace, and a grindstone; add to these a glazier's diamond, a hand drill, some bottles of oil, varnish, and acid, a little mastic and wax, a glue pot, and a few pieces of tin and brass wire, and you have the entire fittings ot the useful man's workshop, which his employer will very soon be willing to augment by the addition of a lathe, a small forge, and a galvanie battery, with some crucibles and porcelain vessels. There would thus be completed, insensibly, as occasion presented, a country workshop, which would be the delight of the owner, to whom all these nick-knacks of handicraft are a sealed secret, and who, in a short time, would become an inventor like his useful man. This latter would be the favorite of the chil-dren, for he would mend their little balloons, little wagons, and little mills; the favorite of the old folks, whose spectacles he would repair ; the favorite of the cook, for he could tinker up her pans, and fresh solder the coffeepot ; the favorite of the lady, because he could mend her fan and make the drawers of the cabinet to slide in smoothly; the favorite of the neighbors, who would be ready to ha"ve him to dinner, to put a string to the piano, arrange the French clock, and see what is the matter with the pump. In fact, I can assure you that the useful man would be the envy of the township, provided he knows neither Latin nor algebra, and reads no political papers,—if he does this, he will be like every body else, and the best thing that can be done will be to give him a letter of recommendation to your nearest neighbor. There would be a vast exportation of useful men to the Brazils, Peru, and Mexico, every hacienda would like to have one; they would be the preservers, the civilizers of the new world; the Russian boy-ard would contend for them with the Spanish hidalgo; the Hungarian magnates with the Turkish pachas, and perhaps the Chinese mandarin with the Indian nabob. The useful man would be the necessary link in th chain that ought connect the man of science and the daily workman, foir he would lay one hand on the theory and the other on the practice, and would often take the place of the two— [Translated from " L'Invention."