nistry and Physics. 297 



through which passes a central tube ; 



and also a small lateral one, bent to one siae. me A'apor is ignited 

 at the mouth of the large tube, and a small tube recurved at its 

 lower end, through which a stream of oxygen is passing, is immedi- 

 ately inserted, the opening being closed by a cork which slides upon 

 the small tube. The flame of the benzol vapor is thus extinguished 

 and the oxygen burns in the vapor in the flask, with a smoky flame. 

 The excess of vapor passes ofi" through the small lateral tube. 



(3.) The processes of oxidation and reduction and the conse- 

 quent changes in weight, Thomsen shows thus: cupric oxide is 

 mixed with gum-water to a stifi" paste and formed into cylinders, 

 flattened on their sides, about a centimeter in diameter and 3 

 centimeters long. These are then dried, ignited, and reduced by 

 hydrogen at the lowest temperature possible. A cylinder of 

 metallic copper is thus obtained, very porous but sufticiently co- 

 herent to retain its fonn. These are wound with platinum wire, 

 the two ends of whicb are melted into glass tubes by which they 

 are handled. Two small tubulated glass bells are filled, the one 

 with hydrogen, mouth downward, the other with oxygen, mouth 

 upward, by displacement, the gases being allowed to flow slowly 

 into them during the experiment. One of the copper cylinders is 

 warmed to expel moisture, and immersed in the oxygen; it is 

 raised at once to ignition and remains so until completely oxidized. 

 It is then plunged into the bell-ja,r of hydrogen ; it again begins 

 to glow, the water formed runs down the side of the bell, and the 

 cylinder is reduced to copper again. These combustions, the one 

 in oxygen, the other in hydrogen, both evolving much light and 

 heat, are very striking ; and as the increase in weight of the cylin- 

 der by oxidation is almost a gram, it may be shown on an ordinary 

 balance.— ^67". Berl. Chem. Ges., iii, 930, Dec. 18V0. g. f. b. 



2. On 03oneaw£?^w«020we.— ExGLERandNASSE have mvesti- 

 gated the production of antozone by the method of Meissner (this 

 Journal, II, xxxvii, 325, xxxviii, 18, 1, 213). They used an ozon- 

 izing tube 85 centimeters long, containing 28 wires enclosed m 

 glass, and a coil sufficiently powerful to render the entire bundle 

 of electrodes luminous in the dark. If the ozomzed oxygen be 

 passed through a U-tube 30 centimeters long and one centimeter 

 in diameter, containing zinc-sodium in fragments, the ozone odor 

 disappears completely. If the same tube be placed between the 

 potassium iodide solution and the water over which the cloud 

 appears, the formation of the cloud is not interfered with ; thus 

 showing that it is only the ozone and not the antozone which is 

 destroyed by the zinc-sodium. Since Meissner. concedes that the 

 ozone must be removed to detect the antozone, it follows that 

 f re the antozone formed in the electrizing tube, the gas issuing 

 from it after passing through the zinc-sodium tube and thus being 

 deprived of ozone, Ihould, on bubbHng through water, Foduee ^ 

 cloud; but this the authors find not to be the case. Moreover^ 

 hey show that if the stream of oxygen issuing from the potas- 

 sium iodide solution be passed through a tube 1-3 meters ion„. 



