449 
Dr. Henry's Experiments on Ammonia. 
appear to undergo any change. Eleven hundred discharges 
from a Leyden jar had no effect on a quantity of the gas, 
equal to about one tenth of a cubic inch. Its bulk, after this 
process, was unaltered ; no carbonic acid could be discovered 
in it ; and there was no decided trace of oxygen gas in the 
residuum. The carbon, it appears, therefore, which exists in 
carbonic oxide, must be held combined by an extremely strong 
affinity. 
With sincere esteem and respect, I am. 
Dear Sir, 
Your faithful and obliged friend, 
WM. HENRY, 
