LECTURES 



ON 



THE PHYSICAL FOKCES. 



LECTUEE I. 



THE FORCE OF GRAVITATION. 



IT grieves me much to think that I may have 

 been a cause of disturbance in your Christmas 

 arrangements (*), for nothing is more satisfactory 

 to my mind than to perform what I undertake ; 

 but such things are not -always left in our own 

 power, and we must submit to circumstances as 

 they are appointed. I will to-day do my best, 

 and will ask you to bear with me if I am unable 

 to give more thii a few words; and as a substi- 

 tute I will endeavour to make the illustrations 

 of the sense I try to express, as full as possible ; 

 B 



