STELLAR SYSTEMS AND NEBULJS. 201 



at Carlsruhe, where, on April 14, 1905, he died 

 in his eighty-sixth year. Otto Struve detected 

 500 double stars, among them y Andromedse, 

 discovered in 1842, and 8 Equulei, discovered 

 in 1852, within a period of between five and 

 eleven years. 



Various other astronomers have devoted them- 

 selves to the observation of double stars, among 

 them Ercole DembowsJci (1815-1881), of Milan; 

 Karl Hermann Struve (born 1854), son of 

 Otto Struve; William Doberck (born 1845); 

 William J. Hussey (born 1864), now director of 

 the Detroit Observatory; Camille Flammarion; 

 N. C. Duner; G. V. Schiaparelli ; Thomas 

 Jefferson Jackson See (born 1866). But the 

 greatest living discoverer is Sherburne Wesley 

 Burnham (born 1838), now employed at the 

 Yerkes Observatory, in Wisconsin. Born in 

 1838 at Thetford, Vermont, he commenced his 

 career as a shorthand reporter, studying astron- 

 omy in his leisure hours. With a small 6-inch 

 refractor, mounted in a home-made observ- 

 atory, Burnham commenced in 1871 his dis- 

 coveries of double stars, which soon attracted 

 the attention of noted astronomers, who per- 

 mitted him to use larger telescopes, with which 

 he continued his researches. His first official 

 appointment was in 1888, when he became 



