214 W. A, Norton on Molecular Physics. 
different fundamental forms, and the various physical conditions 
2 
which the energy of the molecular forces depend. It is conceiv- 
able that such differences may result from the heat evolved in 
the process of crystallization. Let fig. 3, a,b, c¢,d,e, &c., be a 
line of particles crystallizing 3. 
in regular succession. en 
@unites with b, the heat given @ &~e~¢@ = 
out will expand the atmos- “= “™ — 
phere of c, and it is possible that after this effect has been produced, 
the expanded atmosphere will not become condensed under the 
operation of the crystallizing forces, asmuch as it otherwise would 
ave been; and hence that the molecular attractive force of ¢ 
sulted. 
* The hypothesis of a permanent polarity of atoms, or molecules, has subserved 
ee er one physical eoneeption, 
ro! 
ot late in it as a supposed h of 
It will be conceded that it is the dictate of true eilosopey to hold it m 
ee until it shall have abundantly evident t ene 10 
ion cannot be deduced from the i nstituti 
_ and of the primary forces of attraction and repulsion, to which all other 
