RESEARCH METHODS IX STUDY OF FOREST ENVIRONMENT.. 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 Avill 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. 
FormZ 
Daily observation at 
Date or station No ' 
Time l 
Datum: 
Maximum temperature, air. 

Minimum temperature, air. 
Current temperature, air. . . 
Current thermograph pen . . 
Psvcro meter : 
Drv bulb 
Wet bulb 
\nemometer dial 
Soil temperature : 
Surface 
1 foot 
2 or 4 feet 
( 'urr . thermograph 
Evaporimeter — Number: 
Closing reading 
i 

Refilled to 
.. .. 
Ymount since last ob 
Evaporimeter — Number : 
Closing reading 
Refilled to 
Amount since last ob 
i 
Current precipitation: 
Water, inches 
S now on the ground , inches .... 
Frost ''indicate by X or XX) 
Phenology: 
Tree 1 
Tree 2 
Tree 3 
s 
I;;;;;:;;;::::::::::::::::::::::: 
i 
i 
Date or month 
Initials of observer 
