230 



ASTRONOMY 



In 1858 there were 7,625 volumes, 143 maps, 14,634 dissertations. 



In 1880 there were 11,077 volumes, 168 maps, 23,208 dissertations. 



A comparison of this collection with the bibliography of Lalande 

 (using the resources of Paris) is given below. Column 1 shows the 

 date of publication of the books; 2 shows the number of volumes at 

 Pulkova not known to Lalande, and 3 shows the number of volumes 

 mentioned by Lalande which are not at Pulkova : 



The Astronomische Nachrichten, the copyright of wbich is involved in 

 the Schleswig-Holstein question, has been remodelled and will in future 

 be published under the editorship of Dr. Krueger, the director of the 

 observatory at Kiel, in co-operation with the president of the German 

 Astronomical Society, of which association it will be a recognized organ. 

 The new arrangement can produce nothing but good results, some of 

 which are already evident. 



A copy of the treatise of Copernicus, "De Hypothesibus Motuum 

 Coelestium," in a more perfect shape than any hitherto known, has been 

 discovered at Stockholm Observatory, stitched into a copy of his "De 

 Eevolutionibus Orbium Coelestium" which originally belonged to He- 

 velius. 



