Observations of 500 Nebula. 



23 



which double distances or A$ were observed and the measurements 

 consequently executed without coincidences, this is indicated by 

 the sign * . 



Coll. 5 and 6: the mean Acl s and A$" for 1865,0. 



Double-Col. 7: descriptions of the nebulae according to the scheme p. 20. 

 Col. 8: the comparison — stars indicated by their numbers in the catalogue, 



and the nebulse employed as comparison-stars designated in the 



usual manner. 



Col. 9: mean hour-angles, by which is indicated the position of the tube 

 during the observation, and which besides are sufficiently exact 

 for computation of the small occurring corrections of refraction. 



