- 
478 Scientific Intelligence. 
of the needle shows that the equi-potential lines are turned in the 
opposite direction from the magnetizing current—for gold and 
A planet 
will not move round the sun unless it be constantly acted upon b 
a force deflecting it from thé straight path. A grindstone will 
bal 
ye. oe 
anced by centripetal force. My difficulty is to understand what 
tendency of the rotating material of the vortex-atom is controlled 
the exterior incompressible liquid. But it is also stated 
h : 
the motion of the atom is concerned this liquid is a perfect void. 
Now, if this liquid can offer no resistance to the passage of the 
in : 
