408 Scientific Intelligence. 



afforded on analysis the formula N 2 H 6 0(HC1) 2 , but the crystals 

 dried by means of the anhydrous salt, contained one-fifteenth of 

 their weight of water. When mixed with platinic chloride, vari- 

 ous double salts are obtained, according to the proportions. 

 When the chydrazaine hydrochlorate is in excess a yellow salt is 

 obtained, differing in appearance from the double salt of ammo- 

 nium, and having the formula N 2 H 6 . H 2 PtCl 6 . With an excess 

 of the platinum chloride, the platinum in the salt is increased. 

 The sulphate is obtained in minute crystals, soluble in water and 

 in alcohol. Mixed with aluminum sulphate, it forms an alum 

 crystallizing in octahedrons. The nitrate crystallizes readily ; 

 but during evaporation, nitric acid, nitrous oxide, nitrogen and 

 the substance H 2 N 2 are evolved. — Bull. Soc. Ch., II, xlix, 850; 

 J. Ghem. Soc, lvi, 14, January, 1889. g. f. b. 



4. On a new Stannic acid. — Spring has described a new 

 stannic acid obtained by the action of barium peroxide upon stan- 

 nous chloride. For this purpose a saturated solution of stannous 

 chloride in water, containing hydrogen chloride, is treated with 

 an excess of barium peroxide at the ordinary temperature, the 

 peroxide being produced by precipitating hydrogen peroxide 

 with barium hydrate. A turbid liquid is obtained which cannot be 

 obtained clear either by subsidence or filtration. By dialyzing 

 out the barium chloride formed, which in the author's experiments 

 required three months, and by evaporating on the water bath, the 

 white colloidal jelly becomes a white mass, corresponding on 

 analysis to the formula H 2 Sn„0 7 . In the analysis both the water 

 and the oxygen were directly determined. The author calls it 

 hyperstannic acid and regards it as proof of the existence of 

 hyperstannic oxide, Sn0 3 . — Bull. Soc. Ohem., II, li, 1 80, February, 

 1889. G. F. B. 



5. On Ethyl Fluoride. — Moissan has produced ethyl fluoride 

 by allowing ethyl iodide to drop slowly upon silver fluoride con- 

 tained in a brass vessel, care being taken to moderate the tem- 

 perature. By means of a lead worm above the vessel cooled to 

 — 20°, the volatilized ethyl iodide is condensed and returned to the 

 silver salt; the last traces of the iodide being removed by pass- 

 ing the product over silver fluoride, and then collecting it over 

 mercury. As thus obtained ethyl fluoride is a colorless gas of 

 specific gravity 1'70, having an agreeable ethereal odor. Under 

 normal pressure it liquefies at — 48°, and under eight atmospheres 

 at 19°. By suddenly diminishing the pressure it may be solidi- 

 fied. Water dissolves 1-98 volumes of it at 14°. Ethyl iodide 

 dissolves 14-8 volumes. Ethyl bromide, ether and alcohol also 

 dissolve it freely, the gas being expelled unaltered on heating. 

 The gas is dissolved also by concentrated sulphuric acid. It 

 burns with a blue flame which becomes green when small quanti- 

 ties of methyl or ethyl chloride are present. When mixed with 

 a small quantity of oxygen it burns with a bright flame ; with 

 an excess of oxygen it explodes violently when ignited. Heated 

 to 108° in sealed tubes with potash solution it yields potassium 



