RESEARCH METHODS IN STUDY OF FOREST UN VI RON ME .NT. i63 



in the " Corrections " column of the field form " Daily Observations." 

 Interpolations of this character should be indicated by asterisks on 

 the " Humidity, Wind, and Evaporation " form. 



TABULATION. 



The tabulation of evaporation data on the " Humidity, Wind, and 

 Evaporation" form consists in setting down all of the recorded 

 weights of the evaporimeters, or graduate readings, and the losses 

 computed therefrom. In the record for porous cup atmometers, 

 there will usually be but one entry for each observation, though 

 these instruments may also be handled on a weight basis more satis- 

 factorily than on a volume basis. The corrections for calibration 

 are made usually on the sums for 10-day periods. 



Form Z 



Daily observation at 



Date or station No ' 







i 



Time 

















Datum: 



Maximum temperature, air 





















( Jurrent temperature, air 











( 'urrent thermograph pen 











Psycrometer: 



T>rv hulb 











Wet bulb 











\ nemometer dial 











Soil temperature: 



Surface 











1 foot 











2 or 4 feet 











Curr. thermograph 











Evaporimeter— Number: 



( Hosing reading 





i 







Refilled io 













\ mourn Bince last ob 















Evaporimeter X umber: 



< 'losing reading 















Refilled to 













\ mount since la^l ob 













Current precipitation: 

























Snow on the ground, inches. . . . 













| in<li'-;it<- l>v X or X X I.... 

























Phenology: 



Tree] 













Tree2 









Tree 3 













































I'at/' or month 



Initials of observer 



