310 J. C. Watson—JIntra-Mercurial Planets. 
Art. XXXVI.—On the Intra- Mercurial Planets ; by Professor 
J.C. Watson ; from letters to the editors, dated Ann Arbor, 
Sept. 3d, 5th and 17th, 1878. 
ANN ARBOR, Sept. 3, 1878. 
laces of the two objects observed by me during the 
for more precise information in regard to the cbservations than 
had been published in the newspapers. I have since made a 
mean of these readings are shown by the following: 
Chronometer Times. Washington Object : 
By Newcomb’s. | By Watson’s. Mean Time. Observed. Circle Reading. 
4” 39™ 505 5" 7™ 315 Sun 165°31°6 +0'°7 
10° 29" 158 & 18.87... (a)... 18h. Ve eee 
10 30 24 5 b) : 
4 55 10° 6 99 51 - Son 161 889 20% 
S.,4 60 § : ‘ 
5 46 55 6 14 86 Sun 148 21°7 +07 
By comparing the mean of the second and third readings 
upon the sun with the two extreme readings, I have obtain 
the following expression for the correction for eccentricity : 
R, =R+103"7 sin (R+63°°2). 
and hence we derive: 
Washi M.T. Object observed. 
Sun 
5* 7" $7 ee". 187 
5 16 37 (a) 159 49°3 
17 46 () 155 1°8 
O° 22. ob Sun 160 25°2 
5 $2 $i Sun 157 87°2 
6 14: 36 8 147 27°4 
