18 



REPORT OF THE AGRICULTURAL RESEARCH 



The records of evaporation from a plain water surface, 

 after being maintained for about three years, were con- 

 cluded during the past year because it seemed that no use- 

 ful object would be served by more extended records. The 

 data, together with others on the same subject, have been 

 published as a Memoir. With the aid of these data, and 

 others obtained at Lyallpur by the Irrigation Department, 

 an empirical formula was deduced for the calculation of the 

 evaporation at any place in India with the aid of the usual 

 meteorological data. The accompanying chart illustrates 



DAILY EVAPORATION. 



10 



* 6 



E 4 



the quantity of water which becomes dissipated per day 

 during the year at Pusa, Lyallpur and Madras. It rises to 

 a much higher figure at Lyallpur during the hot weather 

 than at Pusa or Madras, whilst during the cold weather 

 the rate at Madras is higher than either of the other 



stations, 

 follows : 



The total water evaporated per annum is as 



Lyallpur 



Pusa 



Madras 



