418 NATURAL HISTORY. 



unless the body be over-long. The cause is for that 

 the more dense body hath a more violent pressure of 

 the parts from the first impulsion ; which is the 

 cause, though heretofore not found out, as hath been 

 often said, of all violent motions ; and when the 

 hinder part moveth swifter, for that it less endureth 

 pressure of parts, than the forward part can make 

 way for it, it must needs be that the body turn over : 

 for, turned, it can more easily draw forward the 

 the lighter part. Galilams noteth it well, that if an 

 open trough wherein water is, be driven faster than 

 the water can follow, the water gathereth upon an 

 heap towards the hinder end, where the motion 

 began, which he supposeth, holding confidently the 

 motion of the earth, to be the cause of the ebbing 

 and flowing of the ocean : because the earth over- 

 runneth the water. Which theory, though it be 

 false, yet the first experiment is true. As for the 

 inequality of the pressure of parts, it appeareth 

 manifestly in this ; that if you take a body of stone 

 or iron, and another of wood, of the same magni 

 tude and shape, and throw them with equal force, 

 you cannot possibly throw the wood so far as the 

 stone or iron. 



Experiment solitary touching water, that it may be the 



medium of sounds. 



792. It is certain, as it hath been formerly in 

 part touched, that water may be the medium of 

 sounds. If you dash a stone against a stone in the 

 bottom of the water, it maketh a sound. So a long 



