THE LIGHT OF THE STABS. 175 



The stars were divided by Lockyer into seven 

 groups, according to his views of their tempera- 

 ture, rising through gaseous stars, red stars of 

 Secchi's third type, and a division of solar stars 

 to the Sirian type, and falling through a second 

 division of the solar type to red stars of Secchi's 

 fourth type. 



The first spectroscopic star - catalogue was 

 published in 1883 by Vogel, assisted by Gustav 

 Mutter (born 1851), a son-in-law of Sporer. The 

 catalogue contained details of 4051 stars to the 

 seventh magnitude, and more than half of these 

 proved to be of Secchi's first type. Vogel's work 

 was completed in different latitudes by Duner 

 at Upsala, and by Nicolaus Thege von Konkoly 

 (born 1842) at O'Gyalla in Hungary. 



The famous * Draper Catalogue ' ranks as the 

 greatest catalogue of stellar spectra. It was 

 undertaken at Harvard Observatory by E. C. 

 Pickering, in the form of a memorial to Henry 

 Draper, the successful spectroscopist. Com- 

 menced in 1886, and published in 1890, it con- 

 tains photographs of the spectra of no fewer 

 than 10,351 stars, down to the eighth magnitude. 

 Pickering subdivided Secchi's types into various 

 classes, the first or Sirian into four classes, the 

 second into eight, while the third and fourth 

 types each constitute a separate class. Pickering 



