264? GASES ABSORBED BY CHARCOAL. 



21ft. On trying the fame hidrogen gas with a piece of char» 

 coal which had been kept about four hours in the bright folar 

 light, I had only an abforption of fix lines. 

 Azote gas. 22d. I next proceeded to the examination of azote gas. I 



began by examining that obtained from atmofpheric air, in 

 which a candle was extinguilhed. 

 The abforption was fix inches. 



23d. I examined that obtained by the combuftion of fulphur, 

 and had an abforption of feven inches and three lines : it is to 

 be obferved that this gas always contains fulpbureous acid, and 

 for that reafon more of it was abforbed. 



A fecond experiment with the charcoal g^ve me feven inches 

 and two lines. 



I afterwards tried the azote gas obtained from atmofpheric 

 air in which I had extinguithed a large piece of charcoal under 

 a bell : the abforption was feven inches fix lines ; but this gas 

 always contains a little carbonic acid, and confequently there is 

 a larger abforption, 



24"th. To be fure of having the pureft azote gas without 

 mixture, I took the gas obtained by decompofing nitrous acid 

 by means of hidrogen gas, which laft gas had been obtained 

 from the decompofition of water by iron. 



The abforption was only fix inches and one line. 

 We have not yet very correal ideas with refpe(5l to azote : 

 it appeared to me, however, in feveral of the experiments 

 which I made with atmofpheric air, that when it is united 

 with aqueous vapour, more of it is abforbed than when in a 

 dry ftate. Befides it is evident that the azote gas is not much 

 abforbed, which correfponds with my firfl: experiments. 



(The Condiifion in our next.) 



xr. 



On the Commerce of Hens Eggs, and on their Prefervation. Bj/ 

 M. Parmentier *. 



The bulk of -^ HERE are very confiderable differences ifi the eggs of 

 the v^^g does hens in refpefl to fize. Some are as large as the eggs of ducks, 

 much ^n^the** while Others refemble thofe of pigeons. M. Parmentier, from 



on the breed * ¥^o^ Bulletin des Sciences, Tom. III. p. 214. 



pf the hcut • obfervations 



