176 On the E st Furnace in the Manufacture of Iron. 
Gas taken from the mouth of the furnace and dried. 
Carbonic acid, . i ¢ 12°88 . 
Carbonic oxide, . 2 ; ‘ ‘ 23°51 
Hydrogen, co. : : ; 5°82 
Nitrogen, . ‘ 57°79 
The vapor of water in a hundred volumes of this gas, varies 
from nine to fourteen volumes. Examinations made at different 
times show the proportion of hydrogen and nitrogen to be nearly 
uniform, and that the sum of the volumes of carbonic acid and 
carbonic oxide is constant, but that there is a variation in their 
respective proportions. ’ ‘ 
Gas taken from the interior of the fire-room at 5 to 10, and 13'to 
17 feet from the mouth, ( fire-room 36 feet.) From five to ten feet, 
the proportion of moisture diminishes, the other ingredients re- 
maining about the. same. F'rom thirteen to seventeen feet, the pro- 
portion of carbonic oxide increases, while the carbonic acid and 
hydrogen diminish. \ ! 
Gas from the bottom of the fire-room and top of the boshes. 
This is remarkable for the constancy of its composition, and for — 
the absence of carbonic acid and watery vapor. Composition— 
Carbonic oxide, . : ue 35-01 : 
Hydrogen, . : : : goes 1-92 
Nitrogen, . ; : ‘ “ f 63-07 
‘ eae Srom the bottom of the boshes and commencement of the 
earth. : 
Carbonic acid, . 3 ; : 0-31 
Carbonic oxide, . ’ re 41°59 
Miytieairenisie. ois ney to obi BE) ig 1-42 
Nitrogen, 4 : ; ’ . 56.68 
Gas from the neighborhood of the tuyer. 
Carbonic oxide, . 5 ; ; 51:35 
Hydrogen, 1:25 
Nitrogen, 47-40 
whereas the reverse would appear to be the case by the analyses 
here given. Besides, from a glance at the composition of the 
