TRANSACTIONS OF THE SECTIONS. 53 
The oxide employed weighed ...........0c0.eeseuee 1:6700 gramme. 
In 15 hr. 8:2 litres of gas had passed over, when the 
substance weighed ........ RI Sa ncletche up ecele ce 15955 cp, 
In 2°5 hrs. 16°5 litres of the gases had gone over, and it 
Tp CLT Ae ria tee cacacicacicaci ee Se artes 1-561 Ne 
For every 100 parts of iron it consisted of— 
Tron in the metallic state ............ Biers opyere = 65 
TRON AS; ATM OXI, s, cis: 01545%> heyeiplayteusti hate) Smiwiagset esis 93-4 
ESV MAT g cscpslecepeieht s1al syoiensyeusuagaysPorskoustuartiour ste Ke. ¢ 32°2 
MOAR PIOYER oie, 2, fare,» oa! «; cache) ofaxsbavereenahecy tarcks aitage efeh acre 1:5 
Experiment 5,—Spongy iron was similarly exposed. 
The original metal weighed.............cceeeeesees 1:1340 gramme. 
After 15 hr, ae to 7°7 litres of gases it weighed 15015 _s,, 
After 2°5 0. 17 a 5 15635 ss, 
After which for every 100 parts of iron it consisted of— 
Tron in the metallic state ........cceeeeeveees 4°93 
Tron as an oxide .......... FOO OLCOTT ic 95-7 
Associated With OXYgen.....sccseeeeereeeeees OO 
Carbon...... as atten berets icsts atataraye amen oes 4-7 
In these last two experiments the oxygen and iron exist in proportion of 6 
equivalents to 5; and haying regard to the circumstances of the trials, it appears 
probable that a position of static equilibrium has been reached. 
The quantity of carbonic acid was then doubled, ¢. e. for each volume of cyanogen 
30 volumes of carbonic acid were made use of. 
Experiment 6,—Pure peroxide of iron heated to 770°-780° C. was exposed to 
such a mixture (1 yol. Cy+30 vols, CO,). 
Weight of peroxide of iron employed............. ... 1:0615 gramme. 
After 2 hrs. exposure to 8 litres of gasesit weighed .. ‘9915 ,, 
After 3 rb - t 1:0130 _s,, 
For every 100 parts of iron the product consisted of— 
Tron in the metallic state..........0eeseee Sudip tGOU 
MEENAS: AGRO) os dia eta on 42 45,4,0.0,0 Uda 00.88 99:10 
Associated with oxygen .........e cess evens 33°82 
WArDODEer ee iseptae os Teeee Lou St oat aC One 2°52 
Here, again, 6 equivalents of oxygen are combined with 5 of iron, but the metal 
in its free state is diminished in quantity. The small difference in weight between 
the ends of the second and third hour indicates here the probable absence of further 
change. 
The next series of experiments was performed in a Griffin’s blast-furnace at a 
temperature at which cast iron is fused. 
Experiment 7 proved that a mixture of 1 volume cyanogen and 6 of carbonic 
acid were unaltered by mere exposure to this degree of heat. 
Experiment 8,—W hen the two gases in these proportions, 1 vol. Cy +6 vols. CO,, 
were passed over peroxide of iron, the amount of nitrogen and carbonic oxide was 
very trifling. On examination it was found the ferric oxide had fused with the 
substance of the porcelain, and thus it might have interfered with the action. A 
trace of carbon was detected, probably deposited as the apparatus cooled. 
Experiment 9.—The temperature was lowered, but with the same results as in 
Experiment 8. 
Experiment 10.—Further reduction in the temperature, but still no definite 
result was obtained. 
Experiment 11.—Recourse was again had to Hofmann’s furnace, and a bright 
red heat employed something under fusing-point of silver, 
