Chapter 1.XXXVII.
Your sudden and unexpected arrival, quoth my uncle Toby, addressing himself to Dr. Slop, (all three of them sitting down to the fire together, as my uncle Toby began to speak)--instantly brought the great Stevinus into my head, who, you must know, is a favourite author with me.--Then, added my father, making use of the argument Ad Crumenam,--I will lay twenty guineas to a single crown-piece (which will serve to give away to Obadiah when he gets back) that this same Stevinus was some engineer or other--or has wrote something or other, either directly or indirectly, upon the science of fortification.
He has so,--replied my uncle Toby.--I knew it, said my father, though, for the soul of me, I cannot see what kind of connection there can be betwixt Dr. Slop's sudden coming, and a discourse upon fortification;--yet I fear'd it.--Talk of what we will, brother,--or let the occasion be never so foreign or unfit for the subject,--you are sure to bring it in. I would not, brother Toby, continued my father,--I declare I would not have my head so full of curtins and horn-works.--That I dare say you would not, quoth Dr. Slop, interrupting him, and laughing most immoderately at his pun.
Dennis the critic could not detest and abhor a pun, or the insinuation of a pun, more cordially than my father;--he would grow testy upon it at any time;--but to be broke in upon by one, in a serious discourse, was as bad, he would say, as a fillip upon the nose;--he saw no difference.
Sir, quoth my uncle Toby, addressing himself to Dr. Slop,--the curtins my brother Shandy mentions here, have nothing to do with beadsteads;--tho', I know Du Cange says, 'That bed-curtains, in all probability, have taken their name from them;'--nor have the horn-works he speaks of, any thing in the world to do with the horn-works of cuckoldom: But the Curtin, Sir, is the word we use in fortification, for that part of the wall or rampart which lies between the two bastions and joins them--Besiegers seldom offer to carry on their attacks directly against the curtin, for this reason, because they are so well flanked. ('Tis the case of other curtains, quoth Dr. Slop, laughing.) However, continued my uncle Toby, to make them sure, we generally choose to place ravelins before them, taking care only to extend them beyond the fosse or ditch:--The common men, who know very little of fortification, confound the ravelin and the half-moon together,-- tho' they are very different things;--not in their figure or construction, for we make them exactly alike, in all points; for they always consist of two faces, making a salient angle, with the gorges, not straight, but in form of a crescent;--Where then lies the difference? (quoth my father, a little testily.)--In their situations, answered my uncle Toby:--For when a ravelin, brother, stands before the curtin, it is a ravelin; and when a ravelin stands before a bastion, then the ravelin is not a ravelin;--it is a half-moon;--a half-moon likewise is a half-moon, and no more, so long as it stands before its bastion;--but was it to change place, and get before the curtin,--'twould be no longer a half-moon; a half-moon, in that case, is not a half-moon;--'tis no more than a ravelin.--I think, quoth my father, that the noble science of defence has its weak sides--as well as others.