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XXVI. Account of a new Kind of inflammable Air or Gafs , 
which can be made in a Moment without Apparatus , and 
is as fit for Explofion as other inflammable Gaffes in ufe 
for that Purpofe ; together with a new fheory of Gun- 
powder. By John Ingen-Houfz, Body Phyflcian to their 
Imperial Majeflies , and F. R. S. 
HE important difcoveries on different kinds of air 
have opened a new field for one of the moft 
pleafing and interefting fcenes which ever were expofed 
to the contemplation of philofophers, and therefore 
could not fail of exciting in almoft every lover of natural 
knowledge a decided curiofity to fee the purfuit of fuch 
ftriking novelties, and in many an almoft irrefiftable 
temptation to imitate them, and to purfue farther the 
road already fo far opened by the Rev. Dr. Priestley, 
Abbe fontana, Mr. lavoisier, and many other learned 
and ingenious men. 
Who can, indeed, without the greateft fatisfa<5lion, 
look (amidft many other objedts of admiration) upon the 
Read March 25, 1779. 
difcovery 
