SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



280 ■ 



STATEMENT AND EXPOSITION 



CERTAIN HARMONIES 



THE SOLAR SYSTEM. 



BY 



STEPHEN ALEXANDER, LL.D., 



PKOFESSOK OF ASTROHOMY IN THE COLLEGE OP KEW JERSEY. 



[accepted POK PDBLICAHOH, JULY, 1874.] 



WASHINGTON, 



MARCH, 1875. 



