178 W. A. Norton on Molecular Physics. 
Again the notion that a certain substance radiates light of a 
certain color because its molecules are made to vibratem 
unison with the ray of that color, will not stand; for the 
it isin entire accordance with my own, for according %0 TEs, — 
light originates in certain vibratory movements of the atoms 
the electric atmospheres of molecules, and when these vibrate 
naturally in unison with the ray of any color that falls oi | 
them, they take up its vis viva, and so the ray 18 ansfort 
As to the “leading principles” laid down by the author, be 
may in the main be conceded; but these by no means “ind, ft 
tive molecules of different substances. The natural t 
would be to a fortuitous association of elements inant by 
iN dri pcre ce 
pros uniformity would be evolved from chaotic ie : 
objection here urged, derives 8 envelOP 
form, different for each substance. ‘To assume the en" 
such molecules, is to make an incalculable number fe 
ter 0 
