40 fUture'0 /Miracles. 



kind must combine to make a molecule of an 

 elementary substance. Two atoms of hydro- 

 gen combine with one of oxygen to form one 

 molecule of water. It cannot exist as water in 

 any smaller quantity. If we subdivide it, it no 

 longer exists as water, but as the original gases 

 from which it was compounded. 



We have shown in the series on Sound, Heat 

 and Light that they are all modes of motion. 

 Sound is transmitted in longitudinal waves 

 through air and other material substance as 

 vibration. Heat is a motion of the ultimate 

 particles or atoms of matter, and Light is a 

 motion of the luminiferous ether transmitted 

 in waves that are transverse. Electricity is 

 also undoubtedly a mode of motion related in 

 a peculiar way to the atoms of the conductor. 



Notice that there is a difference between con- 

 duction and radiation. The former transmits 

 energy by a transference of motion from atom 

 to atom or molecule to molecule within the 

 body, while the latter does it by a vibration 

 of the ether outside as light, radiant heat, 

 and electromagnetic lines of force. 



For the benefit of those persons who have 

 not read Vol. II, where the nature of ether 

 is discussed somewhat, let us refer to it 

 here, as it plays an important part in the ex- 

 planation of electrical phenomena. Ether is a 

 tenuous and highly elastic substance that tills 

 all interstellar and interatomic space. It has 



