C0LORIFICATION IN GENERAL. 



tion which subsists between impression ?tnd 

 sensation, between the substance without,, &n$ 

 the sensitive principle within, between the 

 primary and secondary qualities of matter 

 Without a previous knowledge of these subr 

 jects, optics, or the laws of vision, can never 

 be scientifically understood ; or the nature anc| 

 cause of cojor be ascertained. 



If sensibility be separated from animation, 

 and animation from matter, all the secondary 

 properties of matter, are at once obliterated ? 

 and lost ; solids are bereaved of their figure, 

 liquids of their flavor, gases of their sound, and 

 light of its colors. Except the attribute of ex-- 

 tension, which is common to the whole, nothing 

 is left to solids but their resistance, to liquids 

 but their mobility, to gases but their expansi- 

 bility, and to solar rays, nothing but their, 

 motion. Ignorant of these truths, the genera- 

 lity of chemists haje confounded the sensation 

 with the impression, and mistaken the one for 

 the other, not only with respect to the different 

 secondary qualities which I have described, but 

 more especially to those by which the sedations 

 of heat and of cold, are excited, and which I 

 shall designate by the generic name of TEMPS.-. 



HATXJRE. 



