stricture in the throat, and sometimes to bring on a spitting of blood when they have been incautiously inhaled by the engraver. At such times it is usual for the engraver to have near him some powerful essence, generally hartshorn, in order to counteract the effects of the noxious vapour. For biting-in on steel, _nitric_ acid is used in the proportion of thirty drops to half a pint of distilled water; and the mixture is never used for more than one plate.--When a _copper_-plate is sufficiently bit-in, it is only necessary to wash it with a little water previous to removing the etching ground with turpentine; but, besides this, with a _steel_ plate it is further necessary to set it on one of its edges against a wall or other support, and to blow it with a pair of small bellows till every particle of moisture in the lines is perfectly evaporated. The plate is then rubbed with oil, otherwise the lines would rust from the action of the atmosphere and the plate be consequently spoiled. Previous to a steel plate being laid aside for any length of time it ought to be warmed, and the engraved surface rubbed carefully over with virgin wax so that it may be completely covered, and every line filled. A piece of thick paper the size of the plate, laid over the wax while it is yet adhesive, will prove an additional safeguard. For this information respecting the process of biting-in, the writer is indebted to an eminent engraver, Mr. J. T. Wilmore.] There are two subjects by Albert Durer, dated 1512, which Bartsch thinks were etched upon plates of iron, but which Mr. Ottley considers to have been executed upon plates of a softer metal than copper, with the dry-point. There are, however, two undoubted etchings by Durer with the date 1515; two others executed in the same manner are dated 1516; and a fifth, a landscape with a large cannon in the fore-ground to the left, is dated 1518. There is another undoubted etching by Durer, representing naked figures in a bath; but it contains neither his mark nor a date. The three pieces which Mr. Ottley thinks were not etched, but executed on some soft kind of metal with the dry-point, are: 1. The figure of Christ, seen in front, standing, clothed with a mantle, having his hands tied together, and on his head a crown of thorns; date 1512. 2. St. Jerome seated amongst rocks, praying to a crucifix, with a book open before him, and a lion below to the left; date 1512. 3. The Virgin, seated with the infant Christ in her lap, and seen in front, with St. Joseph behind her on the left, and on the right three other figures; without mark or date.--One of the more common of Durer’s undoubted etchings is that of a man mounted on a unicorn, and carrying off a naked woman, with the date 1516.