OPPOSITION OF MARS, 1849--50. 



MICBOMETRICAL OBSERVATIONS, 



WITH 



THE 8i-FEET EQUATORIAL, 



AT THE 



ROYAL OBSERVATORY, CAPE OF GOOD HOPE: 



BY THOS. MACLEAR, ESQ., F. R. A. S., <feo., 



HER MAJESTY'S ASTRONOUEK AT THE CAPE. 



