100 



Bituminous 

 odour from its • 

 folution. 



The proccfs with 

 coal of blood, 



gives ammo- 

 niacal gas. 



Inflammation. 



with oxigcn ; 



9ttended with, 

 cxpanfion. 



ON OtLY HIDROGEtf. 



fhort every ene is convinced on touching it, that it is iron re-* 

 duced to its primitive ftate, and that if it were formed into a 

 raafs, it might conftitute bar-iron. 



As carburet is formed in this operation, the diflblution of 

 the iron yields the fame bituminous fmell as that which is 

 obferved in crude iron. 



If inftead of wood-charcoal, that of blood well wafhed be 

 mixed with the oxide, ammoniacal carbonate will be depofited 

 in the neck of the retort. I have explained the caufe of this 

 product in my fecond memoir on Pruffian blue. The folution 

 of iron then affords phofphate with the potafh at the firft mo- 

 ment of its precipitation. The bituminous odour of the folu- 

 tion of caft. iron as well as the gas, are alfo obtained from re* 

 cently made charcoal of blood, by the application of fulphuric 

 acid, it takes fire at the mouth of the matrafs. The reafon of 

 this is fo evident, that it would be fuperfluous to dwell on it. 



Four inches of this gas, and one of oxigen, cannot be in- 

 flamed in a tube with the charge of a pocket electrophorus ; 

 neither can it with two of oxigen, nor even with three. My 

 object in thefe experiments was to difcover if charcoal or oil 

 would be precipitated. 



Laftly, with four inches of oxigen or equal parts an inflam- 

 mation takes place ; but it caufes an agreeable furprife to ob- 

 ferve that, on opening the ftop-cock, the gazeous refidue in- 

 ftead of being diminifhed, is on the contrary, increafed to 

 thirteen or fourteen inches. This fudden expanfion is accom- 

 panied by another fa6l equally curious, the explanation of 

 which is obvious, on recollecting the obfervation of Monge, 

 on an atmofphere more or lefs compreffed. This is a cloud or 

 thick mift which fills the tube as the refidue efcapes from its 

 former compreflion. Let us now examine our eight inches of 

 mixture which has increafed in bulk to thirteen or fourteen by 

 the inflammation. 



On transferring it through lime-water, it will be found that 

 it fcarcely troubles it, and even at fometimes not perceptibly 

 at all. It alfo, within a few lines, prefer ves its dimenlion* 

 of thirteen or fourteen inches. 



If a light be prefented to it, it will be feen that it is not 

 oily hidrogen. Its blue flame defcends flowly, and it is con- 

 fumed without the leaft detonation.. Laftly, it has but a weak 

 odour very different from that of oily hidrogen. 



This 



