Messrs. Allen and Pepys on Respiration. 4,2$ 
nounced to be azote : it is the constant residuum in almost all 
our experiments upon gases, but who shall say whether this 
residuum is a simple substance or a compound ? 
The^experiment of Professor Berzelius, leads us to suspect 
it of metallic properties ; and those of Davy make it probable 
that it is an oxydated body ; the subject is still under discus- 
sion. But we may fairly indulge more than a hope that the 
ardent zeal, and well directed labours of the philosophers just 
mentioned, will throw a new and important light upon this 
obscure and difficult subject. 
3 K 
MDCCCIX. 
