254 bonate with ABSTRACTS OF CHEMICAL PAPERS APPARATUS, ETC. Simple Gas Absorption Apparatus. H. D. Richmond and E. Hembrough. ( J . Xoc. Chem. I d , 1917, 36, 317.)-The apparatus illustrated consists of two parts. The inner tube, made from tubing of 4 mm. internal diameter and about 15 em. long, has eight bulbs of about 12 mm. diameter blown on it, and the ends are expanded into small funnels of about.the same diameter. This tube lies within a tube of about 17 mm. diameter and 20 em. long, tqhe bottom being drawn out and sealed to an inlet tube of 3 mm. diameter, bent in the form of a U. I n this tube is placed 10 to 15 C.C. of absorbing liquid; the gas edters by the inlet tube and bubbles up through the bulb tube, taking up some of the liquid right. to the top of this, so that a very large absorbing surface is exposed.Experiments are described which show that the apparatus is more efficient khan the " ordinar>- wash-bottle. " The apparatus is easily made, easily cleaned, and not at all fragile. G. C. J. New Acid Sodium Phosphate and its Action on Glass, Poree- lain, Silica, Platinum, and Nickel Vessels. J. H. Smith. (J. Sot. Chem.I d . , 1917, 36, 419-420.)-The new salt is easily prepared in an impure state by evaporating mixtures of sodium hydroxide or car- a sufficient. excess of phosphoric acid and igniting the residue at a bright red heat. The salt is a fused, glassy mass, which dissolves slowlp in cold,APPARATUS, ETC. 255 but more readily in warm water. It appears io have the composition Na,P,O,,, but, in spite of the high ratio of acid to base, is nearly neutral to both methyl orange and phenolphthalein. On prolonged boiling with water it is converted into sodium rnetaphosphate and free orthophosphoric acid.Its corrosive action on glass, porcelain!, platinum and silica is remarkable. At a red heat the glaze of porcelain is destroyed snd a deposit of granular silica usually left; silica vessels are also a.ttacked and platinum rendered so bribtle that a dish which has contained the fused salt tears like paper.A nickel vessel was attacked until the residue consisted entirely of sodium and nickel pyrophosphates, the action being far more energetic than that of phosphoric acid alone or of met<aphosphate, both of which attack nickel vigorousl?. The author proposes to call $he new salt sodium polyphosphate.G. C. J. Electro-Analysis using Silvered Glass Basins in Place of Platinum Cathodes. J. Gewecke. (Cbm. Zeit., 1917,41,297-298.)-The silvering is effected as follows: The inner surface of a glass basin is ground by means of a sand-bla.st, and the basin is then washed, successively, with hot sulphuric acid and potassium bichrornate mixture, sodium hydroxide solution, nitric acid, and water.To pre- pare th>e silvering solution, 8.5 grms. of silver nitrate are dissolved in 100 C.C. of water, ammonia, is added until the precipitate first formed is nearly dissolved, the solution is filtered, and the filtrate dilukd to 1 litre; 100 C.C. of this solution are mixed with 2 C.C. of 40 per cent, formaldehyde solution, and the mixture is imme- diately poured into the glass basin. The silvering is completed in aboub ten minutes, and the basin is then carefully washed and dried. A thin strip of platinum foil is now bent over the edge of the basin so as to make contact with the coating. After use, the basins axe treated with nitric acid, washed, and then re-silvered. w. P, s.