ASTKONOMICAL PUBLICATIONS. 373 



This journal is devoted exclusively to the publication 

 of original researches and observations in astronomy, 

 geology and kindred branches. It is conducted upon the 

 model of the Astronomische Nachrichten of Professor Schu- 

 macher, and the numbers appear at irregular intervals, 

 as matter accumulates, or important information is re- 

 ceived. A volume consists of twenty-four numbers, 

 each containing eight octavo pages. Vol. I. was com- 

 pleted in April, 1851. Yol. IT. was completed in Sep- 

 tember 1852. Yol. EL in June 1854 ; and No. 22 of' 

 Yol. IY. was published in June, 1856. The numbers have 

 accordingly averaged a little more than one .per month. 



This journal has attained a high reputation, and has 

 imparted a fresh impulse to the cause of science in the 

 United States. It contains numerous observations of 

 newly discovered comets and planets made in Europe as 

 well as the United States, together with remarks respect- 

 ing the orbits of these bodies and various questions in 

 astronomy and the pure mathematics. Notice of the first 

 discovery of a comet or a planet is immediately an- 

 nounced by a special circular, so that the. attention of 

 observers throughout the country is immediately directed 

 to these bodies. 



The tables from which the lunar ephemeris in the 

 Nautical Almanac was computed, have been published in 

 a quarto volume of 326 pages. These tables were con- 

 structed from Plana's theory, with Airy's and Long- 

 streth's corrections ; with Hansen's two inequalities of long 

 period arising from the action of Venus, an# Hansen's 



