CENTRE OF GRAVITY. 



25 



Again, if you are really so inclined (and I do 

 hope all of you are), you will find a great deal 

 of philosophy in this [holding up a cork and a 

 pointed thin stick about a foot long]. Do not 



Fig. 10. 



refer to your toy-books, and say you have seen 

 that before. Answer me rather, if I ask you, 

 have you understood it before ? It is an ex- 

 periment which appeared very wonderful to me 

 when I was a boy ; I used to take a piece of 

 cork (and I remember, I thought at first that 

 it was very important that it should be cut out 

 in the shape of a man, but by degrees I got rid 

 of that idea), and the problem was to balance it 



