103 



Original n 

 energy 11 



Original 

 energy. 



Acquired 

 energy. 



Original 

 energy. 



that space acquired as much more energy as it had of its 

 own. These together would carry it through a space 

 equal to 2 H during the second moment. But he goes on 

 to say that the original excess of energy is still retained, 

 i. e. at the beginning of the second moment, and this would 

 cause it to move another space H, which added to the 2 

 ist mo- H, makes, for the space passed over in the 



ment. 



second moment, 3 H. If we can understand 

 language, this " original energy/' serves in 

 mo- two capacities during the second moment ; 

 meut " first, it helps to move the molecule the dis- 

 tance 2 H, and secondly, it moves it a space 

 H further on its own responsibility. Is not this riding a 

 free horse rather hard ? 



Having dragged this poor unfortunate molecule, as it 

 were by the ears, against its will, through a space 3 H dur- 

 ing the second moment, the author has a still more difficult 

 task to drag it through 5 H, during the third moment. He 

 says : u At the end of the second moment, there are the 

 three degrees of excess of energy retained, and the last one 

 doubled in the gain of its gravity, and the original excess 

 with which it started is still there, so that the body must 

 fall the next moment through 5 H." 



Observe here, how the author marshals 

 his forces. First, he has three degrees of 

 energy acquired by falling through 3 H 

 -g during the preceding moment. Secondly, he 

 | has the one degree of energy acquired 

 3 during the last of the 3 H (second appear- 

 ance !) Thirdly, he has the original energy. 

 The readiness which the second of his forces 

 exhibits to do double duty, to help the au- 

 thor out of his troubles is truly touching. The readiness 

 of Bottom the "Weaver to play all the parts in Pyramus 



acq.' 



3 degre 

 uired e 



energy. 



Last degree 

 doubled. 



Original energy. 



