Summary of temperature observations. 



Mean of warmest day, August 7, 1876 ... 85 .3 



Mean of coldest day, January 8, 1878 17.2 



Absolute highest temperature, August 31, 1876, 96.7 

 Absolute lowest temperature, December 31, 



1890 36-3 



Mean of maximum temperatures ' 51 .26 



Mean of minimum temperatures 33-68 



Mean of the mean maximum and minimum 



temperatures 42 .47 



Mean of three daily readings for the same 



period 42 . 48 



The agreement between the last two numbers in the above 

 list is remarkable. So far as tthese observations go, the average 

 of the maxima and minima is essentially the same as the average 

 of three daily readings when carried through a sufficiently pro- 

 longed period. Taking the records for each separate month 

 of the twenty-four years, it is found ithat about once a year the 

 mean from the maximum and minimum differs from that of 

 three daily readings by as much as one degree. 



A striking result is obtained if we take ithe mean of the mean 

 daily temperature for each month of the period under consider- 

 ation, and then in turn take the mean of the months which differ 

 by six. This is shown, as follows : 



Mean temperature for twenty-four years. 



Comparing these results with the mean temperature for the 

 whole period (42.48), we. observe that in no case does the 

 mean of the pairs of months considered differ by as much as 

 one degree therefrom. It is hoped that other observers who 

 have recorded the data for long periods will apply this test. 



