f^s. 



THE BEGINNINGS OF LIFE. 



9 



'basoning 





'■^^^d by f^i^^ 



^^^tly to be: 

 ' add, that 

 m of bodies 



Then, in 1837, 



the mechanical force employed for the friction 1/ For, 

 as Sir Humphrey Davy reasoned, a motion or vibration 

 of the corpuscles of bodies must be necessarily gener- 

 ated by friction and percussion, and so, he adds, ' we 

 may reasonably conclude that this motion or vibra- 

 tion is heat, or the repulsive power.' 

 Lardner Vanuxem published in Philadelphia an essay ^ 

 in which he speaks of caloric^ light, electricity, and 

 magnetism as being mutually convertible. His utter- 

 ances are, however, somewhat dubious, since he at 

 ^ possil f^j.g^ treats of them as 'four different states' of 'one 

 -rs to me to |<;ind of repulsive matter', though, further on, he ac- 

 ble, to fomi knowledges that the existence of these as 'four dis- 



nng excited 3: 



ai 



tinct fluids, or kinds of ^ethereal matter, is inadmis- 

 , except it sible; for this conversion or change of characters is 

 Davy in his i analogous to what are called the properties of bodies 

 e scientific ei and not to the bodies themselves/ Again, in 1839, 

 aloric' exist Seguin, in a work entitled ^De ^Influence des Chemins 

 that the ^^ ^^ -^^V called attention to the mutual convertibility of 



c 



T fh- sam^ ^^^^ ^^^ mechanical force, and he gave a calculation 



11. 



^ gf[ of their equivalent relation not differing materially 



e nature, 



([ from that afterwards published by Mayer and Joule 



ICC 



;ime P 



rubbi 



revent" 



ter p 

 ative 



rodiice'i 



In January, 1843, in a lecture delivered before the 

 Royal Institution, Professor Grove declared that ' light, 

 heat, electricity, magnetism, motion, and chemical 



heat 



tl! 



^# 



I 



e 



caus 



coiive 



zd th^ 



^ Orme's * Science of Heat/ 1869, p. 163. 



2 ( 



rsio^ 



On the Ultimate Principles of Chemistry, Natural Philosophy, 



and Physiology.' 



I.ii. 



