1919] Coit-Rodgson: Abnormal Shedding of Washington Navel Orange 313 



meter 47 (pi. 41). We are cognizant of criticisms of this instrument 

 by Briggs and Shantz, 48 but believe that for our purpose it is suffic- 

 iently accurate. Due to a lack of a sufficient number of these instru- 

 ments we were unable to run a series simultaneously at Edison and 

 at East Bakersfield but we did operate them under as nearly similar 

 conditions at the latter place in 1917 as at the former in 1916. Know- 



Fig. 3. Comparison of the average daily atmometer water loss from the 

 stations referred to in figure 2. 



ing something of the relative harshness of the two seasons, both as 

 reflected in the amount of dropping and in the data taken by the U. S. 

 Weather Bureau observer at Bakersfield, we are able to approximate 

 fairly well the climatic conditions at Edison in 1917 for comparative 

 purposes. The water loss from our different stations at the two locali- 

 ties is well shown in figures 2, 3, 4, and 5 and in table 5. 



At Edison our atmometer stations were selected as follows : ''Tree" 

 station was located underneath an orange tree near the center of the 

 orchard, about one-half mile to leeward of the edge of the orchard 



*' The Relation of Desert Plants to Soil Moisture and to Evaporation, Car- 

 negie Inst. Washington, Publ. 50, 1906. 



* 8 Comparison of the Hourly Evaporation Rate of Atmometers and Free 

 Water Surfaces with the Transpiration Kate of Medicaqo sativa, Jour. Agr. Res., 

 vol. 9 (1917), pp. 277-96. 



