[ 45 ^ ] 
non-fhot the Velocities may dill exceed the prefent 
Computation. 
The afcertaining the Force of Powder, and thence 
the Velocities of Bullets impelled by itsExplofion, and 
the aligning a Method of truly determining their adual 
Velocities from Experiments, are Points from whence 
every neceflary Principle in the Formation or Manage- 
ment of Artillery may be eafily deduced : Conftdering 
therefore the infinite Import of a well-ordered Artil- 
lery to every State, the Author flatters himfelf, that 
whatever Judgment may be formed of his Succefs in 
thefelnquiries, he will not be denied the Merit of having 
employed his Thoughts and Induftry on a Subject, 
which, though of a moll fcientific Nature, and of the 
greateft Confequence to the Public, hath been hitherto 
almoft totally negleded ; or, at leaft, fo fuperficially 
confidered, as to be left in a much more imperfect 
State than many other philofophical Refcarches. 
With regard to the Second Chapter of this Treatife, 
relating to the Refiflance of the Air, the Author has in 
his Preface mentioned his Intention of annexing to it 
a Series of Experiments, on the real Track of Bul- 
lets, as modulated by that Refiftance: And therefore, 
as he propofes to complete thofe Experiments this Sum- 
mer, unlefs unforefeen Accidents prevent him, he 
choofes to pofipone any Account of the Subjed of the 
Second Chapter till that time, when he intends to lay 
the Refult of thofe Experiments before this Society, 
in order that any Exceptions or Difficulties relating to 
them, may be examined and difeufied before they are 
published to the World. 
The Reader is defired to corred an Error in the Firfl: Paragraph of 
the 29th Page of the Treatife here referred to, where for Fercujfion 
read OfcilJation . 
