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PROCEEDINGS OF THE AMERICAN ACADEMY 



is much to be regretted that no observations were made by any of the 

 large Munich refractors, as they might, at the least, have been able to fill 

 out a great part of the series up to Professor Challis's last observation' 

 " The three orbits are as follovi's : — 



Epoch. June 16.5 Berlin M. T., M. Eq. 1848.0. 



" These three orbits satisfy the series of observations almost equally 

 well, Orbit I. giving the majority of the Right Ascensions somewhat too 

 large, and II. and III. somewhat too small. The sum of the errors is 

 smallest in II., — the sum of their squares in III. The Orbit III. gives 

 the following absolute places, to which is annexed the aberration in 

 decimals of a day. 



" Metis. Mean Berlin Noon. 



