342 H. W. Turpin 
pane 
of COs : 
4.8 = : 
46 VUMer or7 hight CO, s0//. 
4.4 No crap or, (i1gfs CO, FO] «+207 
4.2 e 
4.0 rN 
3.8 N 
3.6 ® 
3.4 s S 
3.2 x v 
3.0 NN 
2.8 ae 
2.6 ® 8 
~ 
2448 § X 
2.27% Ne S 
2.07% 
1.848 x 
1.649 . 
i.445 C 
1.248 is 
1.048 oe ae asia 
0. aes Sn £ Coe. Korner 
all 
0.2- 
U 2 SS 
July August £epi. 
Fic. 56. CARBON DIOXIDE IN AIR FROM DUNKIRK CLAY LOAM PREVIOUSLY CROPPED 
TWICE TO OATS, CROPPED TO MILLET, AND FROM THE SAME SOIL LEFT BARE, 1918 
Per cent 
of CQ 
Ns 
for) 
COO OC CO RR KE RB Re D NW WH DY FWHW WOO Oo Ee P 
5 ; ‘ ; ae OLD ° Ks . sAtve Py yee Tae cer ks thee ee 
OED WDONKFDWAOOTNKHRAONKHD OOD & 
SME or7 low C OQ s01/- 
Ne crop o7 sev CO 50//+--++- 26 
VVOTOGIEOIICT. 
e 
ec cevcces 
Seer wes 
July 
Fic, 57, CARBON DIOXIDE IN AIR FROM DUNKIRK CLAY LOAM NOT PREVIOUSLY CROPPED, 
CROPPED TO MILLET, AND FROM THE SAME SOIL LEFT BARE, 1918 
