122 THE GREEK ASTRONOMY. 



the least cultivated minds, are very clear and de- 

 finite ; namely, the ideas of Space and Figure, 

 Time and Number, Motion and Recurrence. Hence, 

 from their first origin, the modifications of those 

 ideas assume a scientific form. 



We must now trace in detail the peculiar course 

 which, in consequence of these causes, the know- 

 ledge of man respecting the heavenly bodies took, 

 from the earliest period of his history. 



