SCIENTIFIC NEWSif), in j 79 



We are likewise indebted to Mr. Gay-Lussac for oh- Comblnatioas 

 servations on the combinations of gaseous substances with 

 eucb other, intended to show, that they always unite in 

 simple ratios. 



These Observations are followed by a separate paper on Compound* <if 

 nitrous vapour, and on nitrous gas as an agent in eudiome- '^*^^^^* 

 try. In this we see clearly the influence of quantities on 

 the result of combinations. If two parts of nitrous gas 

 and two of oxii^en be mixed, nitric acid is produced, and 

 one part of oxigen remains free. If on the contrary four 

 parts of nitrous gas and ene of oxigen be mixed, nitrous 

 acid is produced, and one part of nitrous gas is left free. 

 Ana, as nitrous gas is composed of equal parts of oxigen . . 



and nitrogen, we know theconstitutions of the two acids 

 with precision. 



Mr. Guyton de Moiveau, in a series of experiments on Water decom* 

 the diamond, and substances that contain carbon, found dia'mooX, 

 that water was deccniposed by the diamond at a very high ^ j 

 temperature, and carbonic {i*,id produced. ■ t 



Mr. Sage has imparted his researches on the revivification Mr. Sage, 

 of silver by mercury in the nit'ate of silver; on an acetate 

 of ammonia obtained from wood by distiiiation ; on the 

 analysis of the- calcareous stone named typogiajjhioai : on 

 the magnesia contained in shells, madrepores, lirapstoie, - ^ 



and arragonite; on an arenaceous iron ore; on an unknown -^^ 



petrifaction; and on a cupreous and ferruginous, petri lied 

 wood. 



^To be continued. J 



dt 





To Correspondents, 



A Constant Reader may find many of the articles he 

 mentions in vols. XVIII, XlX, XX, XXli, and XXIII; 

 others will be inserted as o importunities oCcur. His con- 

 cluding suggestion will be considered. 



METEOROLOGICAL 



