362 Temperature of the British Isles, 1869—1883. [Mar. 27, 



It seemed of interest to exhibit these figures graphically, and 

 Plate 9, illustrating them, has been drawn. All the curves are not 

 shown. Those for Valencia and Falmouth agree so closely, except in 

 July and August, that one line will represent both for most of the 

 year. Similarly, the curves for Armagh, Glasgow, and Stony hurst 

 agree so exactly in every month that one line suffices to represent 

 them. 



I have therefore shown on the diagram four curves for all the 

 months, and five for July and August. The curves represent respec- 

 tively (1) Aberdeen, (2) Kew, (3) Armagh, Glasgow, or Stonyhurst, 

 (4) Valencia or Falmouth, and (5) Falmouth alone, in the two 

 months specified. 



In the diagrams the abscissge represent temperatures and the 

 ordinates the number of days during which those temperatures were 

 experienced. 



It will be noticed that the line representing Aberdeen lies generally 

 on the left hand of the other lines, showing that the lower tempera- 

 tures are most prevalent at that, the most northern station under 

 consideration. In all but the summer months the curves for the two 

 south-western observatories show decided peaks, corresponding to 

 temperatures between 40° and 50° in winter and between 50° and 60° 

 in summer, while at all the other stations the maxima are not so 

 marked. 



The difference between Valencia and Falmouth in August is par- 

 ticularly striking, the figures from 40° to 50° and from 50° to 60° 

 being exactly reversed, Falmouth showing 18'3 days of the higher 

 and Valencia of the lower temperature. 



The two months July and August exhibit the chief material 

 difference in climate between the south-west of Ireland and the south 

 of Cornwall — a difference to the advantage of the latter. 



We also see from Table V that at both of these south-western 

 stations the mean daily temperature in July never falls below 50°, 

 and never rises above 70°. This amount of equability of temperature 

 is approached, but not quite reached, at several other stations in the 

 same month. At several of the observatories the range of daily mean 

 temperature in winter exceeds forty degrees. 



The outcome of the entire enquiry is that, as regards the 15 years 

 under consideration, both (1) the variability of temperature, as 

 defined in the beginning of the paper, and (2) the range of mean 

 temperature, are least at Valencia and Falmouth, the two stations 

 most exposed to the influence of the Atlantic Ocean. Then follows 

 Aberdeen, which, from its close proximity to the sea, enjoys a more 

 equable climate than might have been anticipated from its latitude. 



The three stations of Grlasgow, Stonyhurst, and Armagh form a 

 third group, and they only differ inter se in unimportant particulars. 



