530 SCIENTIFIC RECORD FOR 1882. 



sodium hyposulphite on chromates of the alkalies, forms a fine green pig- 

 ment, which is i^roposed by Ad. Carnot as a substitute for the injurious 

 arsenical and cupriferous colors. 



Paul Sabatier has published a note claiming priority over A. Colson 

 in the discovery of the sulphides of silicium, Si S, and Si SO. 



Constantine Fahlberg has patented a process for preparing sulphate 

 of aluminium free of iron for the mineral bauxite. The essential point 

 in the method is the use of lead peroxide for the removal of the iron; 

 the lead compound being afterwards recovered in a very simple manner. 



Hautefeuille and Chappuis have studied the formation of pemitric 

 oxide, and assign to it the formula N2O6. 



Cailletet has obtained a crystalline hydrate of i)hosphoretted hydro- 

 gen by strongly compressing the gas in the presence of water and then 

 suddenly decreasing the pressure. Hydrates of ammonia and of sul- 

 phureted hydrogen have also been obtained by tWs method. 



Wroblewski, by a somewhat similar method, has obtained a solid crys- 

 talline hydrate of carbonic anhydride, COo 8H2O. 



In a letter to Nature, G. F. Kodwell revives the controversy concern- 

 ing the relative claims of Lavoisier and of Priestley to the discovery of 

 oxygen. Eodwell endeavors to give the greater houor to Lavoisier. 



Hydroxylaminc is found by G. Bertoni and C. Eaimondi to be an act- 

 ive poison when injected into the blood. Less than 0.2 gram killed a 

 medium-sized dog. It also exerts a poisonous effect when introduced 

 into the stomach or under the skin. The blood assumes a chocolate 

 color and yields on dialysis nitrous acid, an oxidation product of hydro- 

 xylaminc. 



Two neio antiseptics, calcium- and sodium -glycero-borates, have been 

 announced by G. Le Bon, and experiments prove their utility. They 

 are odorless and without injurious action on the most delicate tissues. 



The discovery of hydrazin, NHg, claimed by Maumen^, has been denied 

 by several chemists who repeated the process (action of potassium per- 

 manganate on ammonium oxalate) and obtained negative results. 



Bromo -sulphide of carbon has been discovered by Carl Hell and Fr. 

 Urech. It is obtained by the direct action of bromine on carbon di- 

 sulphide, and forms small brilliant jjrismatic crystals having the com- 

 position C2S3Br6. 



Rose's fusible alloy has been prepared by W. Spring by subjecting the 

 constituents (lead, bismuth, and tin) in their proper proportion, to enor- 

 mous pressure. Wood's alloy, melting at 05° C. can be obtained in a 

 similar manner. The pressure employed was 7,500 atmospheres. 



Metallic uranium, according to Zimmermanu, forms a silver-white, 

 somewhat malleable metal, very hard, but scratched by steel. It has 

 a specific gravity of 18.7. It burns with brilliant light and scintil- 

 lations, forming a bulky oxide. It is slowly attacked by warm nitric 

 acid and by sulphuric acid, and readily dissolves in hydrochloric. 

 The Royal Society awarded the Davy medal (in duplicate) to D. Men- 



