. The American journal of science and arts. pper takes the finest polish. Miscellanies. 387 For univrought silvering, take two parts of silver (precipitatedfrom the nitric solution by copper leaves,) two parts cream of tartar,two parts marine salt well pulverized. Apply this in the same wayas above described. When the piece is perfectly whitened, put itinto water containing a little potash. Agitate it well in clear water,without which it will tarnish and become yellow.—Jour, de 13. Glass syphons for transferring corrosive fluids.—M. CoL-LARDEAU has designated the form of a glass
. The American journal of science and arts. pper takes the finest polish. Miscellanies. 387 For univrought silvering, take two parts of silver (precipitatedfrom the nitric solution by copper leaves,) two parts cream of tartar,two parts marine salt well pulverized. Apply this in the same wayas above described. When the piece is perfectly whitened, put itinto water containing a little potash. Agitate it well in clear water,without which it will tarnish and become yellow.—Jour, de 13. Glass syphons for transferring corrosive fluids.—M. CoL-LARDEAU has designated the form of a glass syphon, which saves thenecessity of applying the mouth or even the finger to either end ofthe tube. Dip the end a of Fig. 1. into the fluid to be transferred,and pour into the funnel or side opening b. a quantity of the samefluid, until it flows out of the end c. The fluid in the vessel F. G.,then rises and continues through a d e c. In this case, the branchm n remains full, while the liquid in 6 n subsides to near the bend n. Fiff. The same object is effected by the more simple form of Fig 2.,provided the opening c is closed with a finger until the long branchof the syphon is full,—or, the application of the finger is unnecessaryif the fluid be poured into the funnel faster than it can be dischargedthrough c. In that case, the long branch of the syphon will fill andthen act in the usual way.—Bull. D^Encour. Fev. 1832. 14. Carbonate of lime and its compounds ; (M. Becq,uerel.)—Calcareous carbonate is found in countries of the oldest formation,where it often forms entire mountains. It is found disposed in bedsof a crystalline texture, sometimes saccharoidal, and sometimes more 388 J\liscellanies. or less lamellar. It forms almost the whole of secondary countries,in which it presents a compact structure. In tertiary formations it isalso very abundant, yellowish, loose, and more or less solid. In tu-fas, and concretions, which continue to be found on the surface ofth
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