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To Clean Soiled Engravings

violet color, but when dry is an indigo blue- Lay the engraving, face downwards, in a per- black. In writing, it flows easily from the fectly clean vessel, sufficiently large to allow pen without gumming, and does not thicken the engraving to lay flat; pour clean boiling as soon as common ink. These are no small water upon it, and allow it to stand until the advantages, and ought to recommend it for water is cold: take it out carefully and re- general use. (See No. 2460.) 6410. To Examine Wells or Chimneys. In case the bottom of a well needs examining, hold a mirror in such a position as 6407. Το Mount Prints. Make a thin size of fish glue or isinglass. Take a good sized flat varnish brush, wet the brush with the size just sufficiently to moisten the surface to reflect the sun's rays in the water, so that of the print to the extent of the width of the anything floating on the surface can then be brush and the whole length of the print. plainly seen. If the contents of the well are Commence at one side and continue in this not turbid, the smallest object on the bottom way until you have gone over the whole surface. Draw the brush with a light, quick stroke, as closely each time to the part previously wet as possible, without lapping or going twice in one place. When dry, go over it again in the same way, only at right angles to the first stroke. Let this dry, then proceed to mount as follows: Stretch, as tightly as it will bear, to a frame of the required size, a piece of new, smooth, fine muslin or factory cloth. Rub over the whole surface of this, with a good paste-brush, a sufficient quantity of well-cooked paste, made of equal parts of wheat-flour and starch, to thoroughly wet the cloth. Lay the print onto it, and, covering it with a piece of clean paper, rub it down both back and front, until smooth and fast. When thoroughly dry, varnish with white copal varnish.

6408. Varnish to Imitate Ground Glass. Dissolve 90 grains sandarac and 20 grains mastic in 2 ounces washed methylated ether, and add, in small quantities, sufficient benzine to make it dry with a suitable grain, too little making the varnish too transparent, and excess making it crapy. The quantity of benzine required depends upon its quality, from 1/2 ounce to 1½ ounces or even more; but the best results are got with a medium quality. It is important to use pure washed ether, free from spirit. can also be distinguished. In this way objects dropped in wells of 60 feet in depth, and which contained more than 20 feet of water, have been traced and recovered. When the objects are small, or a minute examination of the bottom is required, an opera-glass may be used. If the top of the well is not exposed to sunlight, a mirror may be placed outside, even at a great distance, to reflect the light over its top, where a second mirror may reflect it downward. Letting a lamp, candle, or lantern down gives by no means as successful a result, as the light is very weak compared with sunlight, and its glare, even when the eyes are shaded from its direct rays, prevents distinct vision. The method of employing two mirrors, one outside reflecting the solar rays in a room, and a second small mirror in its path to reflect these rays into a dark cavity, is employed by physicians, for the examination of cavities of the body; for instance, to explore the tympanum in the human ear, the throat, etc. To examine a straight chimney a piece of looking-glass is to be held, inclined at an angle of 45°, in the hole in the chimney wall, into which the stove-pipe is to go, or in the open fireplace. If the observer can see the light of the sky, he will also see the whole interior of the chimney, and any obstruction in the same. As most chimneys are straight, the top will be clearly visible. 6409. Xylol, the New Remedy for Small-Pox. Xylol, xylene, or ethyl-benzine, as it has been respectively called, is one of the hydrocarbons formed from coal-tar a soft cloth into the mixture and rub over the