330 OUTLINES OF NATURAL PHILOSOPHY. 



preaches the shores, little or no progressive mo- 

 tion. 



In all this, no regard is had to the operation of local 

 causes, winds, currents, &c. by which these gene- 

 ral laws are modified, or overruled. 



833. The dependence of the phenomena just 

 enumerated on the motion of the Sun and 

 Moon, naturally suggests an inquiry into the 

 effects which the action of these bodies may 

 produce on the waters which cover so large a 

 proportion of the Earth's surface. 



334". If m be the mass, and a the distance of 

 the Sun, r the mean radius of the Earth, z the 

 distance of the Sun from the zenith of any 

 place (or the distance of that place from the 

 point to which the Sun is vertical) a particle of 

 matter at that place is drawn toward the Sun by 



a force equal to cos 2; besides having 



977 *y* 



its gravity increased by another force = . 



This is derived from the resolution of forces, in the 

 same way as when the Sun's action on the Moon 

 was investigated. 



When 



