THE RATE OF DECREASE OF TEMPERATURE, ETC. 87 



From observations at 3^ 40°^ p.m. 



Winter. Summer. 



o o 



Madras 817 93*0 



Dodabetta 517 53*2 



30-0 39*8 



Dividing the year into six winter and six summer months, 

 we have the following comparisons : — 



From observations at 9^ 40"^ a.m. 



Winter. Summer. 



00 o 



Madras, less Dodabetta 29*6 35-4 Diflf. = 5*8 



From observations at 3^ 40"^ p.m. 



Winter. Summer. 



00 o 



Madras, less Dodabetta 31*3 37*8 Diff. = 6'5 



As the difference between the winter and summer 

 temperatures at Bombay differs only four -tenths of a 

 degree from that at Madras, a comparison of Bombay 

 with Dodabetta would lead to almost identical results ; 

 and the summer differences being greater than the winter, 

 it is evident that the law which exists in the middle 

 latitudes of Europe holds good also in the low latitudes of 

 Southern India. 



The observations to which I have as yet had access 

 from stations in Northern India are mostly for very short 

 periods; and as the stations are inconveniently far apart, 

 and the differences of altitude between them generally 

 small, the results obtained have been rather discordant, 

 and therefore render it impossible to determine at present, 

 even approximately, the parallel of latitude at which the 

 summer difference of temperature ceases to be greater 

 than that for winter ; and I will therefore now proceed to 

 give the details for the stations in Europe and Asia at 



