OP ARTS AND SCIENCES. 



209 



Temperature 



and Time 



of Ileating. 



Blast lamp, 



30 min. 



" 1 hr. 

 " IJf hr. 



" 2J hr. 



" 3|-hr. 



Oxygen blast, 



20 min. 

 Water blast, 



Volume 

 of Gas 

 evolved. 



5.45 



.05 



5.86 



2.81 



2.31 



2.04 

 2.31 



Volume 

 of Gas 



calc. for 

 10 gr. 



ofMgO 



109. 



.5 

 117.2 



92.4 



92.4 



81.6 

 92.4 



Analysis 

 of Gas. 



0, = 66.6% 

 Na = 33.4 



:02 = 5.98 

 O2 = 53.7 

 No = 40.29 

 Oo = 47.6 

 N; = 52.4 



:02 = 2.2 

 O2 = 38.9 

 No = 58.9 

 0.2 = 34.3 

 No = 64.2 



:0.; r= 1.5 



Remarks. 



Made from carbon- 

 ate. 



Analyses made 

 from one sample 

 of oxide heated 

 under different 

 conditions. 1, 3, 

 & 4 gave tests for 

 nitrates with fer- 

 rous sulphate; 5& 

 6 did not. 



The amount of gas occluded by magnesic oxide is thus far more 

 than that occluded by the oxides of copper, zinc, and nickel. The 

 quantities of carbon dioxide recorded in the table are undoubtedly far 

 from accurate, since the gas was collected over water. It is interesting 

 to note that the amount of nitrogen evolved by the oxide upon going 

 into solution was slightly increased up to a certain point by the increas- 

 ing time and heat of the ignition, while the amount of oxygen was 

 rapidly diminished. 



VOL. XXVIII. (n. 8. XX.) 



14 



