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CARNEGIE INSTITUTION OF WASHINGTON. 



tive to this mean was determined. This necessitated several approxi- 

 mations in order that the mean correction to P. G. C. for each star 

 might be fairly free from the effect due to unequal observation by each 

 of the three fundamental observers. The second approximation 

 appeared to have corrected the mean for this effect, so the third approx- 

 imation was considered definitive. Curves were drawn to represent 

 the residuals. The corrections for relative personal error, when 

 apphed to each series, harmonized them and reduced the probable error 

 of a single observation to =t0!0236 sec 5. 



The following table shows the residuals for each observer clamp east 

 and the adopted values as derived from the curves: 



