SANTIAGO OBSERVATIONS. 



Iv 



the centre of the field, and the corresponding reading was appropriately entered. The circle 

 was read after the transits of hoth objects had been recorded. In these cases, therefore, the 

 declinations are relative, and any accidental errcr in the circle reading is common to both 

 objects. There were no such differential measures of declination with the meridian circle 

 between the planet Venus and neighboring stars, nor was the circle permanently mounted 

 until after the termination of the first Mars series. When it was ready for use, the pre-selected 

 stars of that series were too near the sun for observation, and afterwards the zone work monopo- 

 lized it at the hours when they passed the meridian. Subsequently, Lieutenant Maury, Super- 

 intendent of the Washington Observatory, has, at my request, caused them to be observed, 

 together with the stars with which Venus was compared near the two inferior conjunctions, and 

 their mean places are given in the subjoined tables. After the termination of the second series 

 of differentials with Mars, several additional meridian observations of each comparing star were 

 made for the purpose of rendering them available in cases where no corresponding measures 

 with the equatorial were obtainable. 



Stars with which Mars was compared in 1849 '50. 



Stars with which Venus was compared, 1850-'51. 



* Not found, though repeatedly sought. 



