No sooner was my uncle _Toby_ satisfied which road the cannon-ball did not go, but he was insensibly led on, and resolved in his mind to enquire and find out which road the ball did go: For which purpose he was obliged to set off afresh with old _Maltus_, and studied him devoutly.—He proceeded next to _Galileo_ and _Torricellius_, wherein, by certain Geometrical rules, infallibly laid down, he found the precise path to be a PARABOLA—or else an HYPERBOLA,—and that the parameter, or _latus rectum_, of the conic section of the said path, was to the quantity and amplitude in a direct _ratio_, as the whole line to the sine of double the angle of incidence, formed by the breech upon an horizontal plane;—and that the semiparameter,——stop! my dear uncle _Toby_——stop!—go not one foot farther into this thorny and bewildered track,—intricate are the steps! intricate are the mazes of this labyrinth! intricate are the troubles which the pursuit of this bewitching phantom KNOWLEDGE will bring upon thee.—O my uncle;—fly—fly,—fly from it as from a serpent.——Is it fit——goodnatured man! thou should’st sit up, with the wound upon thy groin, whole nights baking thy blood with hectic watchings?——Alas! ’twill exasperate thy symptoms,—check thy perspirations—evaporate thy spirits—waste thy animal strength, dry up thy radical moisture, bring thee into a costive habit of body,——impair thy health,——and hasten all the infirmities of thy old age.—O my uncle! my uncle _Toby._ C H A P. XXIX I WOULD not give a groat for that man’s knowledge in pen-craft, who does not understand this,——That the best plain narrative in the world, tacked very close to the last spirited apostrophe to my uncle _Toby_——would have felt both cold and vapid upon the reader’s palate;—therefore I forthwith put an end to the chapter, though I was in the middle of my story. ——Writers of my stamp have one principle in common with painters. Where an exact copying makes our pictures less striking, we choose the less evil; deeming it even more pardonable to trespass against truth, than beauty. This is to be understood _cum grano salis_; but be it as it will,—as the parallel is made more for the sake of letting the apostrophe cool, than any thing else,—’tis not very material whether upon any other score the reader approves of it or not. In the latter end of the third year, my uncle _Toby_ perceiving that the parameter and semi-parameter of the conic section angered his wound, he left off the study of projectiles in a kind of a huff, and betook himself to the practical part of fortification only; the pleasure of which, like a spring held back, returned upon him with redoubled force.