24 BULLETIN TOO, XT. S. DEPARTMENT OF AGRICULTURE. 



orating instruments which might also furnish data on sunshine 

 intensity, the evaporation data from the white and black spherical 

 atmometers have been used in connection with the plant studies. 



15 

 14 



13 



IZ 



II 



10 



42B7.6 









\ 

 \ 



\ 

 \ 







\ / 

 \ / 



\ 



35IZ.5 





\ 





Z953.8 











Z604.3 





\ ZZ85.6\ 









\ 



\ 



s 







\ 

 ?56/.2\ 







IZ73.4 











^^^ 





966.9 





7^5>^ 















5Z i 



Oays 70 D 



1 



3ys 65 L 



ays 



Oak- Brush Type Aspen - Fir 



Whiie Sphere 



. - .... Black Sphere 



Difference 



Spruce - Fir 



p IG n. — Summation of evaporation from black and white spheres and the difference 

 between them. Record made during growth studies. Started late. 



BAROMETRIC PRESSURE. 



The barometric pressure was measured by aneroid barometers. The 

 instruments were standardized from time to time at the central sta- 

 tion, where the elevation and pressure were known. 



