|44 ^^ ^^^ emiJlUmrU P4H4 ij/'-AZifi. 



in the infide, nq hydrogeii gas is obtained, but azbtie gif^ 

 gs the iron is ho longer able to take up any of the oxygeii 

 prefented to it by the water. This is an experiment of 

 M- Velin, and was confirmed to nie by M. Mayer. 



13. An experimeilt made by Mr. Lampadius appears to 

 ifjie to prove, in a very fatisfa£lory manner, thtf prefence of 

 Oxvgen in azbtic gas. He fufed arfenic in the pureft azotic 

 sias prepared by the combuftioil of phofphorus. The metal 

 was fublimated, and at the iend of the experiment it was 

 found that it had been in part converted into oxyd of arfenic. 



14. In the combuftion of two gafes to produce water, 

 when the quantity df hydrogeh h too great^ nitric acid is 

 bbtained. 



15. The following experiment, deftribed by Scheele, ap- 

 pears to mfe a hew proof that azot is nothing but Oxydated 

 hydros^en. The following are the words of this celebrated 

 chcmift*: — " I filled a bladder with ait obtained from iroii 

 filincrs dilTolved in the vitriolic acid, and inhaled this air. 

 Having infpired it twenty times, I found myfelf obliged to 

 (jefift. Having recovered a little, I exfpifed, as far as poffiblc, 

 ijU the air contained in my lungs, and then again refpired 

 the inflammable air. After ten infpirations I could infpire 

 tio more. The air, on being examined, Was no longer in^ 

 fammable; but, however, did not render turbid lime water. 

 In a word, it was corrupted air, (azotic gds)." - It may be 

 perceived that in this experiment the pure hydrogen gas 

 combined itfclf in the lungs with the oxygen gas, which 

 remained after the preceding infpirations of atmofpheric air, 

 and formed there azotic gas. 



16. For ;,iriother experiment, which appears to me to cor- 

 foborate my opinion refpefting the nature of azotic gas, we 

 arc indebt'jLi to Mr. Henry, of Manchefter. It was repeated 

 t)v him feveral times, and alvvays with the fame fuccefsfi 

 jiis explanation of this phenomenon, which is very different 

 from mine, beoaufe he believes azot to be a fimple body, 

 tnay be found in the work below quoted. His experiment 

 is as follows : — In a bent tube of glafs he mixed, in a mer- 



* Fon litfi und feite'-, p. 136* 



^ Schcrcr's Al^^melnes "Journal der Cbcmif, Vol. T- p. 9-- 



curial 



