3'S6 Dr. ingenhousz's Account of a 
has the principal properties of the other inflammable 
airs, viz. it will not inflame but where it is in contact 
with common or dephlogifticated air; and therefore 
only takes fire at the top of the veflel containing it, the 
flame going gradually downwards till the w'hole is con- 
famed, if the veflel is of a cylindrical form, and pretty 
wide. If it is diluted with common air, but not fuffi- 
ciently, it will burn as other inflammable air without 
■exploding. Being fufEciently diluted with common 
air, efpecially with dephlogifticated air, it explodes 
with a very great report and a confiderable force. It is 
unfit for refpiration in a concentrated ftate, and is as 
mortal for an animal plunged into it as any other of the 
inflammable airs; though in a diluted ftate it feems to 
be rather pleafant to the organs of refpiration. 
It differs in fome refpedls from the common inflam- 
mable airs; as, for inftance, it is much heavier, as is al- 
ready obferved, than any of the other inflammable airs, 
and even than common air. It does not inflame or ex- 
plode with fo fmall a fpark of eledfrical fire as the other 
inflammable airs, requiring the explofion of a Leyden 
phial to be fired with certainty, though one Angle inch 
of coated glafs will be fufflcient; fo that a Leyden phial, 
containing twelve or fourteen fquare inches of coating, 
may fire an air piftol loaded with this kind of air feveral 
times, 
