Cl 



Thus they argue, " if the world was suddenly stopped, enough 

 heat would be generated to r<-dure it in great part to vapour." 

 If tlu- earth wore stopped by coming into collision with another 

 w..rld (an absurdity also) and it was crushed out of shape, we 

 c-i'iild account for the friction causing heat, but the simply 

 stopping its motion through space would not do so. 



In urder to carry out this great discovery to its fullest limits, 



according to Dynamical principles, we are also told by Profc 



the earth on stopping would assuredly fall into 



the sun, and the heat gem r.i{ i d by the blow would be equal to 



lousand worlds on fire !'' In order to Calm the fears of 1 



tmsophisticated mankind, wo will show in another chapter, howj 



under the existing laws of nature, such an event is impossible. 



Prof. Grove, while endeavouring to show that heat is motion, 

 feels himself compelled to say 1 " We know not the original 

 source of terrestrial heat, far less that of solar heat." 



Brewer states that the principal source of heat is the sun, and 

 Tyndall also means the same tiling when he says i " We are all 

 souls of fire, and children of the sun." 



The climax is, however, reashed by Dr. Lardner when h 

 ays : " Heat is propagated by radiation, which is apparently 

 independent of matter." If the Professor could point out a 

 place where there is heat, or anything else without matter, th 

 scientific world would bo largely indebted to hinu 



