526 Mr. Gladstone on the 



and increased in weight 13-49 grs., or 56-8 per cent. ; the 

 action of various solvents upon the resulting substance indi- 

 cated that it was a mixture of pyroxyline and the new pro- 

 duct. On another occasion, when the transformation by 

 means of nitric acidsp. gr. 1-47 proved to be complete, 29-52 

 grs. of cotton increased 9-51 grs., or 32-89 per cent. But in 

 order to obtain a substance sufficiently pure for analysis 16-29 

 grs. of cotton were treated with enough nitric acid to dissolve 

 the whole ; the new product was precipitated by dilution, 

 and the increase in \veight was found to be 5-34 grs., or 

 32*78 per cent. In these instances there occurred a secondary 

 product containing carbon not precipitable by water. 



When this was subjected to combustion with oxide of 

 copper, the following results were obtained : — 



I. II. Another specimen. 



Substance employed . 3-15 2*985 3*165 



Carbonic acid produced 3-58 3-39 3'55 



Water produced . . . 1-00 1-01 1*14 



Hence in 100 parts, — 



Carbon . 30*99 30*97 30*59 



Hydrogen 3*52 3*75 4*00 



I was unable to obtain any very accurate estimation of ni- 

 trogen by the differential method : the results most to be 

 depended upon were — 



These numbers lead me to think that there are 3 equiva- 

 lents of nitrogen in the compound, especially as I observed 

 during the combustion that the substance became charred 

 even 1 or 2 inches beyond the glowing charcoal, which will 

 account for the deficiency of nitrogen when compared with 

 the carbonic acid. Hence the composition of the new pro- 

 duct coincides very nearly with that calculated from the 



formula C24 \^'^q \^2q^ namely. 



10000 



