PHYSICAL ASTRONOMY. 341 



material world, as in the action of Impulse, Cohesion, 

 Elasticity, Chemical Affinity, Crystallization, Heat, 

 Light, Magnetism, Electricity, Galvanism, the exis- 

 tence of a principle more general than any of these, 

 and connecting all of them with that of Gravitation, 

 appears highly probable. 



The discovery of this great principle may be an ho- 

 nour reserved for a future age, and Science may a- 

 gain have to record names which are to stand on the 

 same levels with those of NEWTON and LA PLACE. 

 About such ultimate attainments, it were unwise to 

 be sanguine, and unphilosophical to despair. 



V END OF VOLUME SECOND. 



