MATTER AND MOTION. 81 



being used merely to verify analysis ; analysis is here 

 used only to aid synthesis. Not to formulate the 

 factors of phenomena is now the object ; but to formu 

 late the phenomena resulting from these factors, under 

 the various conditions which the Universe presents. 



This third class of Sciences, like the other classes, is 

 divisible into the universal and the non-universal. As 

 there are truths which hold of all phenomena in their 

 elements ; so there are truths which hold of all pheno 

 mena in their totalities. As force has certain ultimate 

 laws common to its separate modes of manifestation, 

 so in those combinations of its modes which constitute 

 actual phenomena, we find certain ultimate laws that 

 are conformed to in every case. These are the laws 

 of the re-distribution of force. Since we can become 

 conscious of a phenomenon only by some change 

 wrought in us, every phenomenon necessarily implies 

 re-distribution of force change in the arrangements 

 of matter and motion. Alike in molecular movements 

 and the movements of masses, one great uniformity 

 may be traced. A decreasing quantity of motion, 

 sensible or insensible, always has for its concomitant 

 an increasing aggregation of matter ; and, conversely, 

 an increasing quantity of motion, sensible or insensible, 

 has for its concomitant a decreasing aggregation of 

 matter. Give to the molecules of any mass, more 

 of that insensible motion which we call heat, and the 

 parts of the mass become somewhat less closely aggre 

 gated. Add a further quantity of insensible motion, 



