XII 



PAGB 



7, 9. The tendency of all bodies to one common centre 85 

 9. Various pinions as to the courses observed by the 



planets . . ib. 



10. The harmony which reigns in the course of the 



planets . . 85 



11. Musical experiment ; ib 



12. How bodies are constantly kept at an equal distance 



from their proper centre 7 



CHAP. XIV. 



Of the Copernlcan System ; the Motion of the 

 Earth alout the Sun; and the Antipodes. 



1. Introduction , . 89 



2. The system of Copernicus described ib 



8, 4, 5. The ancients wer well acquainted with the 

 movement of the earth round the sun . 90 



6. Plato's opinion of the sun moving round the earth, 



exploded . , 91 



7, 8. That the earth is round, inhabited on all sides, 



and, of course, has antipodes .9192 



9. Of the sphericity of the earth . . ib. 



CHAP. XV. 



Of the Revolution of the Planets alout their own Axis. 

 1. Tiiat every planet has its particular revolutions , 93 



