NEWTON S PRINCIPIA. 265 



only be correct on the assumption that all the water above 

 the cylinder, sphere, or spheroid, whose fluidity is not 

 necessary to make the passage of the water the quickest 

 possible, is congealed. This Newton himself admits. But 

 such an assumption is by no means a legitimate one. It 

 is also certain, by experiment, that the amount of the 

 resistance depends very materially on the form of the 

 surface of the body. 



[See NOTE VIL] 



