of Edinburgh, Session 1880 - 81 . 
93 
Mr Pliny Earle Chase, of Haverford College, forwarded a post- 
card, dated July 30, 1880, to the Eoyal Society of Edinburgh, 
which was handed to me, whose contents are as follows : — 
“ Ultra-Neptunian Planets. — Professor George Forbes’ hypo- 
7T 
thetical planets are represented by my — series (Proc. Amer. Phil. 
Soc., xiii. 140). 
7T -1 
32 
7 T 3 
32 
7 T 4 
32 
7 r 5 
32 
7 r 6 
32 
7T‘ 
32 
7T 8 
32 
Theoretical. 
•31 
•97 
3-04 
9-56 
30-04 
92-79 
296-52 
Mercury, perihelion, 
Observed. 
•31 
Earth, „ 
- -98 
Asteroids ( = 2 + Mars), 
= 3-04 
Saturn, 
= 9-54 
Neptune, 
= 30-04 
Forbes, I., 
= 100-00 
Forbes, II., 
= 300-00.” 
In May 1880, the Earl of Craufurd and Balcarres, then Lord 
Lindsay, sent a circular from Dunecht, stating that I would forward 
a copy of my memoir to those who were likely to assist in the 
practical search. This led to a distribution of about 100 copies; 
in consequence of which a large number of excellent telescopes 
are now being employed in the search, and a considerable number 
of charts of that region have been forwarded to me. But hitherto 
the observations have been too few to expect results. Mr Newall 
kindly lent me his gigantic refractor ; but during six weeks that I 
was on the watch I had not a single really good night. 
With regard, then, to the future search for the planet, I would 
recommend (1) a search over a zone extending over about five degrees 
on each side of the position indicated by me, and going at least to 
two degrees south of the ecliptic. (2) I would recommend a special 
search in the position indicated by the stars observed by Bumker 
at Paramatta, mentioned in my last communication on this subject 
