Analysis of a Manganesian Garnet. 155 
that pure oxygen was liberated ; and if it took the oxygen, 
ora part of it, from the deutoxyde, already generated by 
the union of carbon and oxygen in the formation of carbonic 
acid, thereby leaving a compound of azote and oxygen in 
the state of nitrous gas—it must have reduced it to the 
protoxyde, or gazeous oxyde of azote, its first degree of 
oxydizement. i 
t is known that charcoal, especially when newly made, 
has the property of absorbing sundry gases, and particular- 
y hydrogen. Might not the charcoal I used have contain- 
ed hydrogen ? If so, might not the nascent hydrogen during 
the action of the carbon, have combined with a part of the 
oxygen of the nitric acid, and formed water; whilst that 
portion of the azote thus set at liberty, by combining with 
the carbon, may have formed the carbnret of azote ? 
The existence of cyanogene, however, is indisputable, in 
whatever manner it may have originate 
azote and two atoms of oxygen form the deutoxyde of azote, 
and two atoms of carbon with one atom of azote form cy- 
anogene. I have not had leisure to repeat the experiment, 
in order to determine the quantity of cyanogene thus gene- 
rated. 
Art. IX —Analysis of a Manganesian Garnet, from Had- 
dam, Connecticut, with a notice of Boric Acid in Tourma- 
lines; by Henry Seyperr. 
gmen 
terminate. Scratches glass and scintillates with steel. 
Very frangible. Structure lamellar. Specific gravity 4.128. 
Fusible, before the blowpipe, into an opake black bead. 
Analysis. 
A. 3 grammes of this garnet, in the state of an impalpa- 
ble powder, were exposed to a red heat in a platina cru- 
cible; after the calcination, the colour of the powder was 
not sensibly altered, and it weighed 2.98 grammes, there- 
