plain aperture, we will perceive that the parts of the water next to the sides of the opening, being liable to the greatest friction, will be the most retarded; and that those in the centre, being liable to the least friction, will be most in advance; and that the friction decreasing gradually from the extremities to the centre, the water will be always flowing in the form of a cone, with the smallest end in advance. This is the exact form of the vena contracta or contracted vein! When the pipes are very small, this attraction of the sides of the pipes to the fluid operates so as to suspend the whole mass, when it is called capillary attraction. This appears to be the extent to which Newton was acquainted with the laws that govern the vena contracta, at the time he published the first edition of his Principia; but in his second edition, published in 1714, he discloses the doctrine of the contracted vein with his usual intelligence. Every body is acquainted with the splendid experiments of the Abbe Bossut, which were published successively in 1771, 1786 and 1796, and any one desirous of examining this interesting subject will consult them at large. Poleni first discovered, that by applying an additional cylindrical pipe to the orifice, of the same diameter, the _expenditure_ of the fluid was increased. This discovery was followed up, first, by Mr. Vince; secondly, by Doctor Matthew Young; and lastly, by Venturi. This last named gentleman published his work on hydraulics in 1798; it was immediately translated and published in Nicholson's Journal of Natural Philosophy, where all the different adjutages, including the one used by the defendant in this action, are accurately drawn and described. They are also noticed, though not in as ample a manner, in Gregory's Mechanics, pages 438, 445 and 447. From all which it was contended, that every one making a contract, must be _presumed_ to be acquainted with the principles of the vena contracta, and of the methods used to overcome it, and that this party had a right to use these adjutages without incurring the risk of a suit. [We understand that the suit, the foregoing interesting sketch of which has been obligingly furnished by one of the counsel, is still, in the language of the lawyers, _sub judice_; the jury having found a verdict subject to the opinion of the court. We are promised a full report of the trial and decision, for a subsequent number.]--ED. For the Southern Literary Messenger. MR. WHITE,--The following sketch was given me by one of those mail stage story-tellers, who abound on our roads, and enliven the drowsy passengers by their narratives. It is founded on fact, and may not be unacceptable to such of your readers as are fond of the delineation of human character in all its variety of phases. NUGATOR. SALLY SINGLETON. Who thundering comes on blackest steed, With slacken'd bit and hoof of speed?--_Byron_.