OF GEOLOGICAL DYNAMICS 



[Address to the Geological Society of Glasgow, 

 April 5, 1869.] 



PAR'] 1 I. Reply to Professor Huxley s Address to the 

 Geological Society of London, of February \ 9, 

 1869. 



PART II. Origin and 7*otal Amount of Plutonic Energy, 

 PART III. Note on the Meteoric Theory of the Sun's Heat. 



PART I. 



I. IN a recent address (February iQth, 1869) to 

 the Geological Society of London, from the Pre- 

 sidential Chair, Professor Huxley directs attention 

 to the two following sentences, which he quotes 

 from my lecture on " Geological Time," delivered 

 to this Society on the 2/th February, 1868 : 



" A great reform in geological speculation seems 

 " now to have become necessary It is quite 



