"Quodque in fine dicit, 'Tu autem Domine miserere nostri,' hoc innuit, ne ipsum quidem bonum officium prædicandi sine alicujus vel levis culpæ pulvere possa pagi. Nam, ut ait B. Augustinus, 'Verbum prædicationis securiùs auditur quàm dicitur. Prædicator quippe cùm benè dicere se sentit, difficile nimis est ut non quantulumcunque spiritu elationis tangat; et quia quasi per terram ambulat et pedes ejus pulvere sordidantur, idcirco misericordiâ Dei indiget, ut in hâc parte lavetur, etiamsi mundus sit totus.'" From this explanation it is plain, that the Monk of St. Albans, writing to the abbot-- "Si vis, veniam; Sin autem, tu autem," would be understood to express-- "If you wish, I will come; but if otherwise, there is an end of the matter." T. C. Durham, April 8. 1851. _Places called Purgatory_ (Vol. iii., p. 241.).--There is a farm-house still called "Purgatory," about two miles south of Durham, east of the London road, and close to the left bank of the river Wear. The farm is part of the estate of a highly respectable family, which has, I believe, always been Roman Catholic. No reason for the name is known in the neighbourhood. T. C. Durham, April 8. 1851. _Swearing by Swans, &c._ (Vol. ii., p. 392.; Vol. iii., pp. 70. 192.).--In addition to what has already appeared on this subject, the following extract from Tyrwhitt's _Glossary to Chaucer_ will, I hope, be acceptable. "Ale and Bred. This oath of Sire Thopas on ale and bred was perhaps intended to ridicule the solemn vows, which were frequently made in the days of chivalrie, to a peacock, a pheasant, or some other _noble bird_."--See M. de Sainte Palaye, _Sur l'anc. Cheval._, Mem. iii^{me}. This practice is alluded to in "Dunbar's Wish that the King were Johne Thomsonnis man" (MS. Maitland, st. v.): "I would gif all that ever I have To that condition, so God me saif, That ye had VOWIT TO THE SWAN Ane yeir to be John Thomsonnis man." And so in the _Prol. to the Contin. of the Canterb. T._, ver. 452., the Hosteler says: "I MAKE A VOWE TO THE PECOCK, ther shall wake a foule mist." The instance given in Vol. iii., p. 192., is recorded by Monstrelet, _Hist. de France, Charles VII._ T. J.