62 New Theories of the Great Forces. 



act so instantaneously, none with such varied 

 exhibitions of power, and none so widespread 

 in their development. 



In the movement of a body of air, the 

 space previously occupied by that body must 

 be resupplied by another of equal volume. 

 This resupply may not necessarily be derived 

 from the circumambient atmosphere as here- 

 tofore supposed. In some instances the 

 resupply is derived in but slight degree from 

 that source, but rather from that great reser- 

 voir, the earth ; as in the instances of whirl- 

 winds and tornadoes. 



Philosophical Considerations draivn from 

 Observation. 



FLAMMARIAN says : " We know that a 

 whirlwind is a column of air which turns upon 

 its own axis, and which advances compara- 

 tively slowly, for, as a rule, a person can keep 

 up with it at a walking pace. This whirling 

 column of air is both caused and set in motion 

 by electricity. " 



If whirlwinds are caused and set in motion 

 by electricity, why may not all other forms of 

 wind be productions of the same force ? PEL- 

 TIER has established both by numerous facts 



