W KROS WAS DISCOVERED 



for something clue; he found what he wan looking 

 ad a new planet betides. What he waa looking 

 <ia one of the no-called nuisances of the heavena, 



sa asteroid, one of about 450, named 4S8 4 . To search 

 aa Heraohel had to do, even though ita where- 

 is waa known, called for labour ami time, The 



astronomer, who waa on the lookout loaaened 



both by expoaing a photographic plate to Uie atarry 



xed atar doea not change its place du 

 the expomiro of tho plate, or, rath- r th-- plate moves 

 aa tho atar moves: a moving body, bo it planet or 

 cornet, doea change its place, A point will thus repre- 

 sent a fixed star; a lin-. however short, and however 

 trace, represent* a moving body. When 

 exposed plate, he saw at 



once tho trace ! : .o asteroid he was in search 



tit another, a t'uinh-r an-1 a longer trace of a 



ii on the plate. It wa th- 



trace of a planet hit ,vn. An examination 



<>f the stranger resulted in th< <li < \, ry that he waa 

 a ball twenty miles in diameter, and, excepting 

 moon, tho nearest of tho planets to us, so near that 

 he may be made to tell us tho exact distance we are 

 Hi- 'liscoverer calif 1 him Eros, Love or 

 from hi* , size. 1 Herachel had 



no such short-cuts to discovery in his day. 

 An immense impulse was given to the study of the 

 by Herschel's disc It was not merely 



what he achieved by b tho spot and on the 



lookout It was also by the lesson he taught astro- 

 rs to do as he lil. A band of -four 

 ***<* flntfttry, April 1899, p. 612. 



