64 Sr. Austin’s Experiments on 
Notwithftanding the utmoft attention, we are liable to a 
(mail error in each of thefe experiments ; and there is con- 
fequently a fmall variation in the refults ; but, I think, they 
concur fufficientjy to juftify the following conclusions. 
1. That the heavy inflammable air contains the light in- 
flammable air in great abundance, 
I apprehend this light inflammable air was, before the appli- 
cation of the eledlncal fpark, a conftituent part of the heavy 
inflammable air ; becaufe, if it were contained in the heavier 
-air not as a conftituent part, what fhould hinder its being 
burnt when the heavy inflammable air is burnt ? Can it be 
•/ 
fuppofed, that the heavy inflammable air fhould contain the 
light inflammable air in crrcumftances of combuftion, and that 
the light inflammable air fhould efcape the fire ? And if the 
lighter air be burnt,; the fame quantity of dephlogifti- 
cated air would be neceffary to faturate it before as after its 
being electrified. But it is evident from the preceding expe- 
riments, that much more dephlogifticated air is neceffary to fa- 
turate the air, after it has been expanded by the ele&xical lhock, 
than before. 
2. That no fixed air is formed during the reparation of the 
lighter air from the heavy inflammable air. 
Here it fhould be observed, that if the con flit ution of the 
heavy inflammable air depended on an union of the light in- 
flammable and fixed airs, as florae have fuppofed, we fhould 
certainly difcover the fixed air, when the other part was fepa- 
rated from it. Or, fhould it be conjectured, that the light 
inflammable air is feparated from water fufpended in the heavy 
inflammable air, in that cafe, would not fixed air be formed 
from the other conftituent part of the water uniting with the 
