n 



64 



777^ BEGINNINGS OF LIFE. 



more 



V 



of nia^ 



pable 



bat 



cap*"'" . 1, 

 with an ifl^ 



feloctance to cl 

 only be overcor 

 jndent, autocr 

 We wil 



pel 



heat, the motion in mass, or molar motion, of one body 

 expends itself as the body is arrested in producing 

 an equivalent molecular motion, or motion of the par- 

 ticles, in its own substance and in those of the body 

 by which it has been arrested. But here there is a 

 simple transference of the motion of the mass into the 



diffuse motion of the particles of the masses. 

 The motion ceases to exist in the mass as what we 

 ordinarily calf motion, though it persists for a time in 

 the atoms or molecules of the masses, and manifests 

 itself in the form of heat. And, similarly, when the 

 expansive motions of the particles of bodies are checked 

 (and mechanical work is done), the heat diminishes in 

 quantity in proportion as a motion of the resisting mass 

 is produced. When heat gives rise to electricity in a 

 thermo-electric pile, a certain quantity of the incident | rise to electric 

 heat ceases to exist as heat. By acting upon the related and an equivc 



metals, it has been able to bring about certain mole- cause the heat 



of other metal: 



cular re-arrangements of the particles of these, and 



owing to this new arrangement, the attributes of the 



metals or their force- manifestations are altered. The 



newly-arranged particles cease to manifest heat, though 



they show an equivalent amount of electrical pro- parties are m- 



perties. Now, in these cases, we do not postulate the 



existence of a peculiar force in the molecules of the 



bodies by the influence of which the incident ph 



•different wa^ 

 Nucing the' 



"^^ "lolecula: 



^ - .1 



H IS the 



into certain molecular rearrangements of an unstable kind, on the over- 

 throw of which the stored-up forces are liberated in new forms, is ^ 

 process that underlies all organic phenomena/ ^Loc. cit. p. 29.) 



I 



