198 



ASTRONOMY. 



are made, and faint stars are put in by their configurations with tlie 

 otlier stars. In the course of these revisions asteroids are frequently 

 found, as although the charts are not primarily intended for this pur- 

 pose they are eminently suited to it. 



Tbis is shown by the fact that Dr. Peters has himself discovered 

 no less than 40 asteroids before any other observer, and several more 

 have been independently discovered by him. 



The charts already Jinished comprise the space as given below : 



I 



Quite as many more charts are either ''begun "(with the catalogue stars 

 laid down) or have the zones completed, needing only comparison with 

 the sky. 



Some idea of the amount of this work may be had from the fact that 



