34 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



makes it his duty to promptly follow up every newly dis- 

 covered member of our solar system, informs us that a 

 dis23atch from Paris dated August 24 has been received, 

 communicating the position of a comet just discovered by 

 the Messrs. Henry, of Paris. This comet was immediately 

 found and accurately observed by Hall ; and it is suspected 

 that there was some error in the original communication of 

 Borelli. According to the system now generally adopted by 

 astronomers, a comet is known by the year and the order of 

 discovery. We have, then, the following comet record for 1873. 

 The Jirst comet of 1873 is the periodic comet of 1867, the so- 

 called Tempel's comet, and was first seen on its present re- 

 turn by Stephan, of Marseilles, on the 3d of April. The secoiid 

 comet of 1873 was discovered on the 3d of July by Tempel, 

 at Milan, whither he had recently been driven by the proscrip- 

 tion of the German citizens in France. This discovery was 

 very generally announced throughout the astronomical world ; 

 but, for some reason, Borelli seems to have been ignorant of 

 it, and to have independently discovered it on July 30, when 

 he announced it as a new comet. Tliis comet was observed 

 by Professor Hall at 3 A.M., August 25, when it was in right 

 ascension one hour and forty-eight minutes, and declination, 

 south, thirteen degrees and twenty-six minutes. Schulhof, 

 of Vienna, finds that this is a new periodic comet, having a 

 period of about six years. The third comet of 1873 is that 

 announced by Borelli on August 19, which, however, can 

 not be found. The fourth and last is that telegraphed by 

 Henry, of Paris, August 24, and which, when observed by 

 Hall at Washington, at lialf past 3 A.M., August 26, was in 

 right ascension seven hours and forty -one minutes, and 

 declination north fifty-eight degrees and fifty-two minutes. 

 It appears as quite a bright comet when seen through a nine- 

 inch telescope, and is moving rapidly eastward and south- 

 w^ard into the head of the constellation of the Lynx. 



THE NEW BUILDING OF THE CINCINNATI OBSERVATOEY. 



A public announcement was not long since made that the 

 plans of the new observatory at Cincinnati had been approved, 

 and were about to be carried into execution. It gives ns 

 pleasure to record the rapid progress that has been made in 

 this work, as evinced by the fact that on the 28th of August 



