xn, c, 1 Brown and Heise; Carbon Dioxide Assimilation 9 
the experimental data are given in full, and the results are 
calculated on the basis of real assimilation for 50 square centi- 
meters of leaf and for one hour. The results of these three 
tables are summarized in Table 5 of the present paper, and 
plotted in fig. 1. The numbers from each table are plotted 
separately. 
Temperature. 
j 0 S 10 15 20 25 JO 
Fig. 1. Relation of carbon dioxide assimilation and temperature at unit light intensity. 
Table 6. — Assimilation experiments at low and medium temperatures with 
unit intensity of light {Matthaei, Tables II-IV). 
Table. 
Experiment No. 
Date. 
Temper- 
ature. 
Read- 
ings. 
Average 
CO 2 assimi- 
lation cal- 
culated for 
50 sq. cms. 
and 1 hour. 
V 
1912. 
Jan. 29 
°c. 
14.4 
5 
Grams. 
0.00282 
VI 
Jan. 30 
18.0 
4 
0 . 00274 
11 1 
VII 
Jan. 25 
25.7 
4 
0.00307 
VIII - 
Jan. 23 
29.1 
4 
0. 00284 
1 
IX.. 
Feb. 1 
33.1 
2 
0.00285 
1 
X 
Feb. 8 
5.5 
3 
0.00285 
XII 
Feb. 7 
10.1 
3 
0.00282 
Tfint 1 
XI 
10.2 
3 
0. 00268 
0.0026 
XIV 
Feb. 11 
14.0 
2 
XIII 
Feb. 5 
14.2 
3 
0.00348 
XV 
Feb. 10 
26.0 
3 
0. 00327 
XXI 
Mar. 1 
-6.0 
2 
0. 0003 
XXII 
Feb. 24 
-8.6 
3 
0.00093 
XXIV . 
Feb. 17 
—1.5 
3 
0.00105 
XXIII 
Feb. 20 
-1.0 
3 
0. 00143 
IV 
XVI 
Feb. 27 
-K 
3 
0. 00202 
\ 
XVII 
Mar. 2 
+2 
3 
0. 00242 
XVIII 
Feb. 13 
+2.4 
3 
0.0026 
XIX... 
Mar. 7 
3.6 
3 
0.00285 
XX.. 
Mar. 4 
8.8 
2 
0. 00297 
XIX 
Mar. 7 
9.1 
3 
0. 0029 
