122 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Page. 
Astronomy, List of papers on—Cont’d. 
on the zodiacal light. S. Alexander. Com¬ 
municated by J. E. Hilgard. In full; 9 
figures ..... i 105, (19) 
on Sir William Herschel’s observations of 
the satellites of Uranus. E. S. Holdep. 
In full . i 106, (30) 
a new apparatus for the investigation of 
personal error in astronomical transit 
observations, J. E. Hilgard. Title 
only . i lOG 
on the position of the planes of certain 
nebulse. C. Abbe. Abstract and refer¬ 
ence . i 109 
on the correction of a comet’s orbit. O. 
Stone. Reference . li 22 
[letter on transit of Venus, 1874.] 0. H. F. 
Peters. Communicated by A. Hall. Ab¬ 
stract . ii 31 
[letter on transit of Venus, 1874.] C. W. 
Raymond. Communicated by A. Hall. 
Abstract . li 31 
[letters] on the operations of the several 
parties sent from the United States to 
observe the transit of Venus on the 8th 
of Dec’r, 1874. A. Hall. Abstract .1131,32 
[letter on transit of Venus, 1874.] W. Hark- 
ness. Communicated by A. Hall. Ab¬ 
stract .11 32 
[letter on transit of Venus, 1874.] G. David¬ 
son. Communicated by A. Hall. Ab¬ 
stract ----- 32 
the expedition to Pekin for observing the 
late transit of Venus [1874]. C. A. 
Young. Abstract .11 33 
on the transit of Venus [1874]. S. New¬ 
comb. Title only .11 41 
two drawings of nebulse, made with the 
XXVI-inch telescope of the U. S. Naval 
Observatory, by Mr. L. Trouvelot, of 
Cambridge, Mass. E. S. Holden. Ab¬ 
stract . 11 51 
the methods of measuring the inequalities 
of the pivots of a transit instrument. 
W. Harkness. Title only .11 68 
the temperature of space. W. B. Taylor. 
Abstract . 11 73 
[search for Vulcan.] E. S. Holden. Ab¬ 
stract .11 85 
the appearance of Saturn’s rings. A. Hall. 
Abstract . 11 94 
on reference catalogues of astronomical 
papers and memoirs. E. S. Holden. 
Abstract .11 95 
the shadow of the ball of Saturn projected 
on the rings. E.S. Holden. Abstract.ii 101 
Page. 
Astronomy, List of papers on—Cont’d. 
a bright spot which [has] recently become 
visible on the ball of Saturn. A. Hall. 
Abstract . 11 102 
the cosmogony. S. Newcomb. Title only..i\. 113 
report of the committee to collect informa¬ 
tion relative to the meteor of Decem¬ 
ber 24th, 1873. Read by C. Abbe. In 
full; 2figures, 1 map ... 11 123, m 
the position of the centre of gravity of the 
apparent disk of a planet. A. Hall. 
Reference . ....11 181 
the results of [a] search for satellites of 
Mars. A. Hall. Abstract and refer¬ 
ence . 11 18(> 
the nebular hypothesis and *^he inner moon 
of Mars. M. H. Doolittle. Abstract, 
11 188, 190 
aerolithic disturbance of planetary mo¬ 
tions. M. H. Doolittle. Abstract .11 199 
the recent transit of Mercury [1878]. S. 
Newcomb. Abstract . 11 199 
a new eye-piece for observing personal 
equations. A. Schott. Title only . 11 209 
the velocity of light and determination of 
the solar parallax. W. Harkness. Title 
only . 11 201 
observaHons of the total solar eclipse, July 
29,1878. S. Newcomb. Abstract .11 202 
notes on the brightness and the stellar 
magnitude of the third Saturnian saG 
ellite, Tethys. E. S. Holden. Read by 
A. N. Skinner. Title only .Ill 18- 
on the supposed discovery ot a irans-Nep- 
tunian planet at the U. S. Naval Ob¬ 
servatory in 1850. A. Hall. Abstract.Hi. 29 
a note on the precession of .stars in right 
ascension. A. N. Skinner. Title only, 
111 21 
on the, satellites of Saturn. A. Hall. Ab¬ 
stract .Ill 26 
a personal equation instrument. J. R. 
Eastman. Abstract .11133, .37 
the recurrence of eclipses. S. Newcomb. 
Title only .Ill 33 
notes on the orbits of Titan and Hyperion. 
A. Hall. Absty.act .Ill 49 
some results from the discussion of the 
observations of the transit of Mercury 
of May 6 , 1878. J. R. Eastman Ab¬ 
stract .Ill 43 
a recent visit toCaliforni.a to inspect a site 
for the new Lick Observatory. S. New¬ 
comb. Title only .Ill 45 
solar parallax from the velocity of light. 
D. P. Todd. Reference .Ill 74 
