33d CONGRESS, ) HOUSE OF EEPKESENTATIVES. ( Ex. Doc. 



1st Session. ) ) No. 121. 



THE 



U, S, NAYAL ASTRONOMICAL EXPEDITION 



THE SOUTHERN HEMISPHERE, 



THE YEARS 1849- 50- 51- 1 52. 



Lieut. ARCHIBALD MACRAE, 



Master S. LEDYARD PHELPS, } Assistants. 



Captain s Clerk E. R. SMITH, 



VOLUME III. 



OBSERVATIONS TO DETERMINE THE SOLAR PARALLAX. 



BY LIEUT. J. M. GILLISS, LL.D. 



SUPERINTENDENT. 



WASHINGTON: 



A. O. P. NICHOLSON, PRINTER 

 MDCCCLVI. 



