372 HISTORY OF ASTRONOMY. 



is derived from the theory given by Le Verrier; the 

 ephemeris of Venus is founded on Lindenau's tables, with 

 corrections from the labors of Breen, Airy and Le 

 Verrier. The ephemeris of Uranus is calculated 'from 

 Bouvard's ellipse, combined with Le Vender's perturba- 

 tions by Jupiter and Saturn, and Peirce's perturbations 

 due to Neptune. The ephemeris of Neptune is founded 

 on "Walker's orbit and Peirce's perturbations. 



The Almanac for 1856 was published in 1853. It 

 constitutes a volume of 574 pages, and is prepared upon 

 nearly the same plan as the preceding volume. The 

 Almanac for 1857 was published in 1854 ; and that for 

 1858 was published in 1855. 



The first periodical undertaken in this country de- 

 voted exclusively to astronomy, was the Sidereal Mes- 

 senger, edited by Professor Mitchell. This was designed 

 to exhibit in a popular form the recent discoveries in 

 astronomy, and by this means to cultivate a more general 

 taste for astronomical science. The work was com- 

 menced in July, 1846, and continued for a little over 

 two years, .when it was abandoned for want of patronage. 



At the meeting of the American Association for the 

 Advancement of Science at Cambridge in August, 1849, 

 Professor J. S. Hubbard presented a paper on the estab- 

 lishment of an astronomical journal in the United States, 

 and the subject was referred to a select committee. The 

 proposition was generally approved, and the first num- 

 ber of the " Astronomical Journal" was issued in No- 

 vember, 1849, under the editorship of Dr. B. A. Gould. 



