51 



consequently the averages given are those of four years only. 

 The Greenwich averages are those of the same four years, 

 1865, 1866, 1867, 1868 :— 



Bath. Greenwich. Difference. 



("Spring ... 47-9 ... 47°7 ... 0°2 

 Mean temperature of -<^ 



(Summer... 61-3 ... 61-3 ... nil. 



(Spring ... 56-1 ... 58-0 ... 1-9 

 Mean of all the highest < 



(Summer... 70-3 ... 73-6 ... 33 



It will be at once seen, judging from these few years, that 

 while the onean temperature of spring at Bath differs by only 

 two-tenths of a degree from that of Greenwich, the mean 

 temperature of summer being actually the same at both places, 

 the mean maximum, or the mean of all the highest, at Bath, 

 is very nearly 2° lower in spring, and more than 3° lower in 

 summer, than it is at Greenwich. 



Let us now see how the case stands with respect to the mean 

 maxunum this last July. At Bath, the mean of all the highest 

 during that month was 78°.5, while at Greenwich it was 82°.0, 

 or 3°.5 higher. This accords with what is stated above ; but 

 let us pass on to inquire how it was on particular days. 



At Bath, in the Institution Gardens, the temperature rose 

 to 80° or upwards on 13 days. Taking the mean of the 

 maximum temperatures that occurred on the eleven hottest of 

 these days, I find it 83°. At Greenwich, the mean of the 

 maxima for the same eleven days* was 88°. 4, being 5°.4! higher 

 than Bath. 



At Bath, the only day on which the temperature rose as 

 high as 90°, was the 22nd, when the maximum was 90°.5, and 

 this was the hottest day in the month. In my garden in 



* In making this comparison, my reason for confining myself to eleven of the 

 above thirteen hot days was simply that I had no means of ascertaining what 

 the highest temperature had been at Greenwich on the other two days. 



