335 H. W. Furrin 
Per cent : Temp. Atm. pr. 
of CQ2 (C.) (inches) . 
29.6 
29.4 
—— mes eee ee eee eee eee at 
29.0 
28.8 
28.6 
eeooceoee eases eo eoe 
eoeeceaee & 
April May June July Aug. Sept. 
Fic. 50. RELATION BETWEEN THE TEMPERATURE OF THE SOIL AT THE TIME OF SAMPLING, 
THE ATMOSPHERIC PRESSURE, AND THE CARBON DIOXIDE IN THE AIR OF THE UNCROPPED 
som, 1917 
Per cent Temp Atm. pr. 
of CCe2 ~~~ (C.) Gnches) 
Carbo Moxude 
VEPPUDETATUTE vecrere® | 2B. : 
1.0 AWPOSPIIEIIC A C5SUTC— — : 
:| 
: 
; 
| 
: 
: 
oie 
B ERE 
ales: 
ee 
a8 
lea: 
: 
D6 
OF AO 
Sige ne 
ej oe 
sl 
: 
: 
: 
: 
: 
: 
: 
: 
TN Se = ee ay eS — 
Jan. Feb. March April May June July Aug. 
Fic. 51. RELATION BETWEEN THE TEMPERATURE OF THE SOIL AT THE TIME OF SAMPLING, 
THE ATMOSPHERIC PRESSURE, AND THE CARBON DIOXIDE IN THE AIR OF THE UNCROPPED 
sort, 1918 
