aE ee, 
a ee 
Cordoba Observatory. 355 
of the truth, and my present means of judging lead me to ex- 
pect somewhat more than 500 zones between the parallels of 23° 
and 80° South Declination. These should contain about 65,000 
conclusion of the undertaking,—for w t eater part of 
another year will be needed to fill up the various regions which 
have been and are “ being lost.” Naturally, in the intensity of 
comet observed in January and February, 1872, but I find 
that I had unfortunately over-estimated the optical power of the 
meridian circle, which had at that time not been mounted. 
Thus there are several of the comparison stars which prove too 
faint for determination with the cirele,—in which instrument I 
