J04 ASSAYS AND OBSERVAtiONS 



inertia of the fmill quantity of matter 

 difplaced in forming the pit or cavity, is 

 quite inconfiderable. The forcie of co- 

 hefion or attradlion amongft the feveral 

 particles of any homogeneous body is' 

 equal and conftant ; and therefore muft 

 produce an uniform refiftance to the mo- 

 tion of any body appli-ed to overcome it, 



or a refinance proportional to the time of 

 the adion. The continued refiftance of' 

 a few attrading particles in a flow mo- 

 tion, and the fucceffive refiftance of a 

 greater number of particles in a quick 

 motion, will equally diminifh the force 

 of a given fpherical body, in an equal 

 time. If then the force of any ball, mo- 

 ving with a certain velocity, be confumed 

 by the refiftance from cohefion in a given 

 time, the force of the fame ball moving 

 with double velocity will be confumed 

 in a double time ; if the velocity be tri- 

 ple, the time will likewife be triple ; and 

 the velocities muft always be proportio- 

 nal to the times in which they are deftroy- 

 cd. From whence it is manifeft, that a 

 ball ftrik-ing with a velocity as 2, muft 



make- 



