But Mr. Brown seems not only to find fault with mental improvement, but also with mechanical and scientific discoveries--he sneers at steam and growls at gas. I contend that the utility of constructing a coach which shall go by hot water nearly as fast as two horses can draw it, at a trifling additional expense, promises to be wonderfully useful. We go too fast, sir, with horses--besides, horses eat oats, and farmers live by selling oats; if, therefore, by inconveniencing ourselves and occasionally risking our lives, we can, however imperfectly, accomplish by steam what is now done by horses, we get rid of the whole race of oat-sowers, oat-sellers, oat-eaters, and oat-stealers, vulgarly called ostlers. Gas too--what a splendid invention--we gain a magnificent light, and ruin the oil-merchants, the whale-fisheries, and the wax-chandlers--it is as economical as it is brilliant;--to be sure we use more coals, but the coal-merchants are all worthy men, and never take advantage of a frost to advance the price of their commodity; coals are evidently, however, not so essentially necessary to the poor as wax candles; therefore, even supposing the price of coals to be raised, and their value enhanced, we light our streets more splendidly, and our houses more economically. Mr. Brown seems to dislike the over-brilliancy of the gas in the public ways, as tending to destroy the legitimate distinction between day and night. I admit this innovation--but let me beg to say, that until gas was brought to the perfection it now is, for external illumination, we never could see the unhappy women who are driven to walk the streets at night, so plainly following their avocations, or ever were indulged with the pleasing prospect of our watchmen slumbering in their wooden sanctums, at the corners of the streets. Mr. Brown appears to dislike Mr. Mac Adam's improvements; these I defend upon several principles; one which I conceive to be extremely important, is, the constant employment they afford to the sweepers of crossings, without whose active exertions no man could ever pass from one side of the street to the other; and another which I firmly believe to be conducive to the improvement of the mind--I mean the activity with which the eye, and the ear, and the understanding must be constantly kept, in order that the individual walking may escape being run over; superadded to which, there is the admirable manure which the sweepings provide for the land. In short, most of the objects of Mr. Brown's vituperation are objects of my respect, and I take the liberty of writing this, in order that he may, if he chooses, enter into a public disputation upon the several points at issue; for which purpose, if he will direct a letter to me under cover to you, I will appoint a time and place where the merits and demerits of the present age may be temperately, calmly, and dispassionately discussed between us. I am, Sir, Your obedient servant, RICHARD WHITE. PUNNING.