54 



only necessary to mention that many of the observations have been 

 made by my son, Mr. John Brinkley, A. B. and comparing the 

 lesuUs of our observations no differences are observed. 



a Polaris in the Spring, 



Themean of 23 gives mean zenith distance = 34° 54' 45", 24.+,7f>p. 



The greatest zenith distance of the pole star when above the pole 

 as affected by parallax, is on Oct. 4. and the least on April 2. Here 

 as well as in the results which follow, the refraction has been com- 

 puted by the French tables. 



