126 ASTRONOMY FOR 1889, 1890. 



decided upon several changes have been made in the original pro- 

 gramme, the work being eventually divided up among the following 

 observatories : 



The work of observation is now finished. Some of the zones have 

 been published (Kazan, Christiania, Helsingfors, Lund), others are in 

 press, and the catalogues have been begun. Three of the catalogues 

 (Albany, Helsingfors-Gotha, and Christiania,) have just appeared. 

 Meanwhile the zones have been extended to the southern sk\', the fol- 

 lowing being to a greater or less extent under way : 



—2° to — 6^ Strasburg. —14-^ to— 18^ Washington. 



—6 to — 10 Vienna. —18 to— 23 Algiers. 



-10 to — 14 Cambridge (U. S. ). 



The positions of the 303 fundamental southern stars are furnished 

 by observations undertaken at the Cape of Good Hope, Madison, 

 Annapolis, Carlsruhe, Leiden, and Strasburg. Gould's southern zones 

 extend from —23° to— 80°, and it is to be hoped that before loug we 

 shall have a catalogue embracing the whole sky, the value of which 

 will be in no wise diminished b}" the photographic chart which is about 

 to be begun. 



The observations for the Helsingfors-Gotha catalogue were made al- 

 most entirely by Dr. Krueger with a 0"'. 15 (5.9 inch) Reichenbach merid- 

 ian circle. The star positions are for the epoch 1875, and besides the 

 right ascension and declination, the precession and secular variation, 

 and wherever possible the proper motion are given. The observations 

 forthe Albany zone were madeby Professor Boss with a 0'". 20 (7.0 inches) 

 Pistor & Martin's meridian circle, the transits being recorded on the 

 chronograph, while Dr. Krueger used the "eye-andear " method. 



The probable errors come otit: 



In right In decli- 

 asceusion. nation. 



Helsingfors ^0^ 101 



; Gotha . 125 



I Albany : 



2 oiiservations ,025 



3 observations .021 



j 4 observations .018 



Experiments were made with wire-gauze screens by Professor Boss 

 to determine the effect of difference of magnitude upon the observa- 

 tions, his result being that a change of one magnitude produced a 

 change of 0*.014 in the personal equation in observing a transit. 



