Updegraff — Flexure of Telescopes. 267 



740 

 Mean Latitude from these Observations 43" 4' 86".84±0.022. 



The latitudes from the different pairs of stars grouped, 

 and arranged according to the zenith distance of the stars 

 observed are as follows : — 



0^ — 10'^ 43'^ 4' 36". 75 ±0".06 11 pairs 

 10 —20 

 20 —30 

 30 —40 

 40 —60 

 60 —70 

 70 —75 36 .71 .08 5 »* 



The mean latitude derived from seven years' work with the 

 same instrument (1884 to 1890 inclusive) agrees exactly with 

 the mean latitude given above. The results for each of the 

 seven years, as printed in Vol. VI., Publications of the Wash- 

 hum Ohservatory^ p. 145, are given below: — 



1884.0 43^ 4' 36". 79 



* This result for latitude is deduced from observations by another ob- 

 server. 



