/ery week on Monday morning from June 6 to October 

 standardized by applying the necessary correction con- 

 e given in the following table : 



It has been ascertained by Dr. Livingston that a 

 of 6.05 c.c. from the evaporimeters corresponds 

 depth, or, in English units (since it is customary to 

 cipitation in inches), 1 53.67 c.c. of evaporation eq 

 depth. For the purpose of a 



nthe 



1 the 



compar 



neters and 

 , with the 



from a chemical water-bath, 25.6 inches i 

 water standing 1 1 cm. deep when the surface is at zero on the scale. 

 " It stands," writes Dr. Livingston, " with the water-surface level 

 with the middle of the evaporimeters to be tested, and about two 

 meters away from them. It is about 1 5 cm. from the ground 

 to the water-level. This level is about 5 mm. below the level of 

 the dish at the beginning of a period, and the vessel is refilled 

 once a day when the readings are made." 



The total precipitation registered at the Garden from June 10, 

 1907, to September 23, 1 907, was 9.32 inches. This amount 

 will be approximately the same for all three evaporimeter stations. 

 Therefore, taking the difference between the amount of precipita- 

 tion in inches and the amount of evaporation from the evaporim- 

 eters in inches, we have : 



