1890.] Temperature of the British hies, 1869—1883. 307 



Falmouth. Stonyhurst. 





E. 



F. 



E. 



F. 





No. 



Mean 

 value. 



No. 



Mean 

 value. 



No. 



Mean 

 value. 



No. 



Mean 

 value. 



Exceeding 

 10° 

 15 

 20 



157 

 2 



6-3 



143 

 3 



6 2 



332 

 24 



7-0 



349 



19 

 2 



6 7 



Kew. 





E. 



F. 





No. 



Mean 

 value. 



No. 



Mean 

 value. 



Exceeding 

 10° 

 15 

 20 



430 



34 

 2 



7 1 



420 

 29 



6-8 



It will be seen that at every observatory except Glasgow the total 

 number of rises exceeding 5° is greater than that of falls of the same 

 amount, and also that the mean value of the rises exceeds that of the 

 falls, except at Aberdeen, where the two numbers are equal. 



Accordingly, in these islands we have the opposite conditions to 

 those prevailing in India, and sudden rises of temperature are more 

 frequent and of greater amount than sudden falls. 



The same fact, as regards frequency, comes out, with two slight 

 exceptions, as regards changes exceeding 10°. 



The instance exceeding 20° at Aberdeen deserves some notice. It 

 occurred December 16, 1882, and was a rise of 23°'8. On that day 

 at Braemar, not far from Aberdeen, the thermometer stood at 9 a.m. 

 44 e>, 2 higher than at the corresponding hour on the previous day, the 

 respective readings being — 8^3 and 35°*9. It is remarkable that this 

 excessive change of temperature was very local, for at Dundee the 

 difference between the successive 9 a.m. readings was only 28 0, 9, and 

 at Glasgow the difference between the successive daily mean tempera- 

 tures was only 12° 6, or more than 11° less than at Aberdeen. 



We next come to deal with the figures for frequency in Table III. 

 vol. xlvii. 2 A 



