[ 371 ] 
then evidently produced left me, and I believe many 
others, who came to view the experiments, no room 
to doubt the Teeming caufe. In which error I Should 
probably have Still remained, had not farther expe- 
riments demonstrated the miflake. 
Whatever apology I ought to make this learned 
Society, for having given in that account premature- 
ly, I believe their great regard to truth, which has 
always been the bafis of their refearches for the im- 
provement of natural knowlege, will require none 
for this. I Shall therefore, as briefly as I can, relate 
the further experiments, that were made, which evi- 
dently demonstrate the error of the former ; and 
from which fome phenomena have occurred, per- 
haps hitherto unknown. 
In order to try what difference the air paffing thro' 
a thinner body of water might occafion, I brought 
the horizontal pipe, which (as mentioned in the 
former account) was placed 1 2 inches under the 
Surface of the water, to within fix inches ; and 
found, on fetting the engine to work, that the 
leaden pipe, for the conveyance of air from the bel- 
lows into the boiler, became much hotter than I had 
perceived it before ; which could not happen, if a 
conSlant cool air had pafled thro’ : and on Shutting the 
cock, which was fixed in the leaden pipe to hinder 
the fleam from afcending into the bellows before the 
engine Should be fet to work, tho’ no air could then 
poflibly pafs thro’, yet the bellows flill continued to 
move with the fame regularity as before ; which, on 
examination, was found defective on the infide, where 
the middle board, that divides the two bodies, was 
warped and cracked in feveral places, thro’ which 
B b b 2 the 
