PATHS OF MOVING PARTICLES SPRUNG 79 



quence of the rotation of the earth, in case such motion is not pre- 

 vented by differences of pressure. In an ascending motion the 

 tendency to deviate toward the wefet is represented by the expres- 

 sion 2( — ) co cos <p as can be very readily proved by the aid of the 



dt. 



principle of the preservation of areas. 



