188 CW. Hinman—New Apparatus for Gas Analysis. 
5°85 per ct.; and for H, 42°93 per ct. ; and these numbers agree 
much better with the numbers of the second analysis. I have 
not been able to find any duplicate analyses of coal gas and not 
many of any kind, so I am not able to compare the accuracy of 
these analyses with that of analyses made with a different appa- 
ratus. Each of these analyses required from three to four 
hours for its execution. 
Analyses of common Air. 
Air collected April 25, 1874, freed from CO. 
210°2 32°07 Air, H,O formed 20°15 
317°2 ATS H, added, O, 6°716 
178-2 27-42 Exploded, per cent of O, 20-94 
Same Sample. 
197-7 30°25 Air, H,O formed 19-00 
304-7 45°15 H, added, 0, 6°333 
173°6 26°75 Exploded, per cent of O, 20°93 
Air collected April 26. 
214:3 32°66 ir, H,O formed 20°52 
3119 46°81 H, added, 0. 6°84 
170°5 26°29 Exploded, per centof O, 20°94 
Same Sample 
207-7 31°70 Air, H,O formed 19°90 
306'1 45°95 H, added, O, 6-633 
168°8 26°05 Exploded, per cent of O, 20°92 
Each of these air analyses required about half an hour for its 
execution. These analyses seem to have about the same de- 
gree of accuracy as the average of those made by Bunsen. 
Gas generated by action of KOH on Fe and Zn. 
.c 
Air 93°5 29°64 18-47 H,O formed 
Gas added 278°5 41°98 12°313 H, found 99°78 @ H,. 
Exploded 151-4 23.51 12°34 gas added 
Same Gas. 
Air 166°3 25°68 14-07 H,O formed 
Gas added 231-0 35°08 9°38 H, found 99°79 ¢ Hz 
Exploded 134°3 21°01 9°40 gas added 
These analyses show that the air was not quite expelled from 
the generating flask before the gas was coll 
