OP ARTS AND SCIENCES. 



415 



TABLE VI. 



The first part of Table VI. contains the stars in which the residual 

 equals or exceeds one magnitude. The first three columns give the 

 Bond number and magnitude and the photographic magnitude, taken 

 from the first, fourth, and fifth columns of Table IV. The photographic 

 magnitude was determined a second time to see if the lai'ge residual 

 was due to error. The results are given in the fourth column of Table 

 VI. The difference in the two measures is given in the next column, 

 and in the last column the residual found by subtracting the second 

 column from tlie mean of the third and fourth columns. The second 

 part of Table VI. gives the corresponding values for the blue stars in 

 which the residual has a negative value exceeding one magnitude. 



The first part of Table VII. contains the stars given in the Bond 

 Catalogue not contained in the photograph, and accordingly marked d 

 in Table IV. As the faintest stars visible in the photograph have a 

 photographic magnitude of about 15.0, it follows that a slight redness 

 of the stars in Table VII. would account for their absence in the photo- 

 graph. The stars marked c in Table IV. are Bond 3G7, 443, 78G, and 

 826 ; although not visible in F, they were detected in G. 



The second part of Table VII. contains the stars which are visible in 

 both the photographs F and G, but are not given in the Bond Cata- 

 logue. The successive columns give a current number, the approx- 

 imate difference in right ascension and declination from & Ononis, and 

 the photographic magnitude. 



Many more objects which cannot be distinguished fi-om stars are 

 visible on either F or G, but not on both. After completing this list, 

 it was compared with the map of the Earl of Rosse (Phil. Trans., 1868, 

 PI. III.). Stars appear on this map which are moderately near Nos. 

 4 and 11, but none are near any of the other stars in the second part 



