32 



RECORD AND DISCUSSION OF TEMPERATURES. 



For the day or summer period we thus obtain the equations : 



May +14.78 = t m -\- &amp;gt;p + 4 3] Whence t m = 15.73, p = 5.918, and q ~ 



June +30.76 = t m -\- Sp + 2q +0.12 as resulting from the normal equations. 



July +38.18 =t m + $p j&amp;gt; r = 15.73 + 5.918 7? + 0.12 Q0.t 



August +31.59 = t m + 8p 2&amp;lt;7 

 September +13.15 =t m + 5p 4 q 



For the spring months : 



March 33.54 = t m 5p + 

 April 9.48 = t m + 



May +14.78 =t m + 5p + 



For the autumn months: 



T=_ 9.18 + 4.832 R 0.05 Q 



September +13.15 = t m + 5p 4q\ 



October 4.13 = t m 6q I T= 4.91 + 3.510 R 0.13 Q 



November. 21.96 = t m 5p 4&amp;lt;?) 



The above 3 values for t m , p, and q are represented by the formulae: 



t m = 15.73 + 0.7. In + 0.96 a ~\ Where n = number of months from the mid- 

 p = + 5.918 0.220M 0.1942rc 3 die of July. For March n = 2; for 



q = + 0.12 O.Oln 0.022n* ) Nov. +2. 



The following table contains their computed values for each month (under 

 discussion). 



These differences between the observed and computed values are very nearly 

 within the probable uncertainty as given in a preceding table. 



For the winter season, the most simple interpolation seems to be the best that 

 can be adopted. We find for December 1st the temperature 26. 5, the mean of 

 the temperatures for November 15th and December 15th, and for March 1st, in 

 like manner; the mean temperature 30. 0. The following table 1 was used for 

 interpolation : 



. 26.5 



28.2 A = l.7 



Mean temperature Dec. 1st . 

 &quot; Jan. 15th 



March 1st 



30.0 



1.8 



1 For the purpose of a ready comparison and uniformity of method, the following expression of the 

 annual variation of the temperature at Van Rensselaer Harbor is here inserted ; it compares directly with 

 similar expressions for other stations given by Kamtz and inserted in the article (Sir John Herschel s) 



