82 Mr Johnston 07i a solid form of Cyanogen 



Two other experiments gave me similar proportions of these 

 two gases, so that the substance analyzed may either be con- 

 sidered as a sesquucSivhMvei^ or as a mixture of a proto-carbu- 

 ret with the bicarburet. The latter is the more probable. 



2. Of another quantity heated in the open air till all metal- 

 lic fumes had entirely ceased, .2 grs. were mixed with 3 grs. 

 chlorate of potash, and 1 of pounded glass, * and exposed to 

 the flame of a spirit lamp. The results were, 



inch. 

 Carbonic acid, = .^6 or 7 atoms, 



Azote, = .455 or 6 atoms, 



inch. 

 Now the carbon in .55 of carbonic acid, :ir .0698 grs. 

 and .455 azote, = .1349 



whole weight, — .2047 grs. 



Almost exactly the weight experimented upon. 



Again 15 grs. of cyanide decomposed in an uncovered glass 

 capsule by the heat of a spirit lamp kft .35 of carbonaceous 

 matter. Of this .3 detonated with 3 grs. of chlorate gave 



inch. 

 Carbonic acid, .82 or 7 atoms. 

 Azote, .685 or 6 



Now, the carbon in .82 carbonic acid, = .104 grs. 

 and .685 azote, = .203 



Whole weight, = .307 which also is 



exceedingly near the weight employed. 



In these two experiments, then, the substance analyzed was 

 a compound of 7 atoms carbon to 6 atoms azote. 



3. The above experiments indicate a Combination of the 

 elements atom to atom, as the limit of the change produced by 

 heat. To obtain this, a quantity of the bicarburet was heat- 

 ed in a glass capsule, till a great part of it was dissipated. Of 



• In all these experiments, a considerable mixture of pounded glass was 

 necessary to make the decompositions so progressive that the products could 

 be collected. 



