D. P. Todd—Search for a Trans-neptunian Planet. 231 
The numbers, then, in the column 2, taken’ in connection 
estimated to be, roughly, 10°. This result was reached on the 
morning of the 10th of October, 1877. During the few days 
Exrrerior Pianetr.—Longitude (1877°84), 170° + 10° 
Mean distance from the sun, 52° 
Period of revolution about the sun, 375 yrs. 
Mean daily motion, 9”°46 
Angular diameter, 2”°1 
Stellar magnitude, 13+ 
Longitude of ascending node, 103° 
Inclination of orbit to ecliptic, 1° 24’ 
To the determination of the four latter results I shall allude 
The Practical Search. 
I should never have been able to execute the telescopic 
search consequent upon the investigation just related, had it 
not been for the courteous offices of Rear Admiral Rodgers, 
