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In the nine following experiments, viz. from N° 84. to N° 
92. inclufive, the valve-vent was made ufe of, and the bullets 
were made to fit the bore of the piece very exactly by means of 
oiled leather, which was fo firmly faftened about them that in 
each experiment it entered the target with the bullet. 
The bullet made ufe of in experiment N° 85. was of wood. 
Thofeufedin the experiments N° 86. and M° By. were formed 
in the following manner ; a fmall bullet was caff; of plaifter of 
Paris, which being thoroughly dried, and well heated at the 
fire, was fixed' in the center of the mould that ferved for rafting 
all the leaden bullets made ufe of in thefe experiments; and 
melted lead being poured into this mould, the cavity that fur-- 
rounded the fmall plaifter bullet was intirely filled up, and a 
bullet was produced, which to the eye had every appearance of 
folidity, but was as much lighter than a folid leaden bullet of 
the 
