74 
DE. E. FEAJS^KLAXD’S EESEAECHES OX OEGAXO-METAELIC BODIES. 
The gaseous mixtiu’e therefore consisted of — 
I. II. III. 
Binoxide of nitrogen .... 8-16 9-07 9-47 
IT. 
T. 3 Iean. 
8-90 
Gas absorbed by fuming SO 3 . . 
24-53 
23-95 24-24 
Gas unabsorbable by fuming SO 3 
66-57 
67-15 66-86 
100-00 
The gas remaining after the action of fuming sulphmic acid yielded the foUowin 
eudiometrical results : — 
VI. 
Pressure of gas used (dry) 
36’9 mm. 
12°-8 C. 
Pressure after admission of oxygen (dry) .... 
144-5 
12°-8 
Pressure after admixture of hydrogen (di-y) 
191-8 
12°-8 
Pressm-e after explosion (dry) 
121-8 
12°-8 
Pressure after action of caustic potash (dry) . 
121-3 
12°-8 
VII. 
Pressm-e of gas used (dry) 
119-9 
14 
Pressm’e after admission of hydrogen (dry) .... 
340-6 
14 
Pressm-e after explosion (dry) 
231-8 
14 
Pressure after admission of oxygen (dry) .... 
401-8 
14 
Pressm’e after explosion 
234-4 
14 
Analysis No. VI. shows that the gas left unabsorbed by fuming sulphuric acid con- 
tains no combustible constituent ; for it did not explode with oxygen, and on ignition 
with hydrogen in presence of excess of oxygen, it neither generated water nor carbonic 
acid ; the diminution of pressm’e produced on explosion with hydi’ogen (TO'O mm.) being 
almost exactly equal to that which ought to be produced by the 47 ’3 mm. of hydrogen 
added. Analysis No. VII. proves that on explosion with excess of hydrogen 119-9 
volumes of the gas consumed 108-4 volumes of hydi’ogen, leaving 119-5 volumes of fi-ee 
nitrogen. The gas therefore contained 108-4 volumes of protoxide of nitrogen and 11-5 
volumes of nitrogen. 
In order to ascertain the composition of the combustible gas removed by fuming 
sulphm'ic acid, the original gas, after the removal of binoxide of nitrogen, was exploded 
with excess of oxygen, so as to determine the amount of oxygen consumed and of 
carbonic acid generated. 
VIII. 
Pressure of gas used (dry) 104'3mm. 14° C. 
Pressure after admission of oxygen (dry) .... 371-5 14 
Pressure after explosion (dry) 317-0 14 
Pressure after absorption of carbonic acid (dry) . . 260-7 14 
