
1905.] On Vegetable Assimilation and Respiration, 
431 
Experiment . XI (July 28, 1904)—Helianthus tuberosus; Weight, 1:96 
grammes ; Area, 71:2 sq. cm, ; Current Rate, 800 c<c.; CO2 =.2°4 per 
cent. (average) till 3.10 p.m. and 5:0 per cent. (average) after 3.10 P.M. 
_Leaf-chamber adjusted Normal to Sun throughout the Day. 




Tempera- | Tempera. 
Time. Tlumination. ture of ture of | 
bath. leaf. 
Be ap . Z i 
9.15—10.40 | Heavy cumuli......... — — 
10.40—11.10 | 10.48, thin cloud ; < ’ 
10.52, slight rain ; } Tae Bat 
11, cloud haze 
11.10—11.40 | 11.10, cloud haze ; { 18 0 20 °8 
11.30, heavy cloud ANT 20 °6 
11.40 a.m.— | 11.40, bright sun ; ey 35 ‘0 
12.10 P.M. 12, cloud haze eae 31-0 
27 °2 
: P.M. . $i 
12.10—12.40 |12.10, sun; 12.25,| [ 27°8 33 8 
faint sun; 12.30, 28 "1 30 °5 
faint sun 28 °4 29 *4 
28 ‘0 32 ‘0 
12.40—1.10 rane sun; later over- 27 +9 29 6 
cn 28 °5 28 4. 
1.10—1.40 | Bright sun; 1.30, Poe 24,4 
faint sun 17-9 | 21-6 
' 140—2.10, |1.40, thin cloud; |{ 17°7 21-4 7 | 
at 1.50, dull; 2, bright|4 17 °6 22°6 >| 
sun ao Lae 22 -2 
2.10—2.40 |2.10, faint sun; 176 226 
2.30, faint sun 17 °3 21°8 {| 
2.40—8.10 | 2.44, sun; 2.52, thin |{ Heated |] 99-4 
cloud Mr 28 °2 
27 6 ti 
8.10—3.40 | 8.12, faint sun; 8.81,/1 ov. |f 28°8 1 
light sun 29 ‘6 i 
—-8.40—4.10 _- Gas out — | 
Cooled 
4.10—4.40 | 4.380, faint sun......... 18°9 . 
17 6 
ey e 5 17-9 17°8 1. 
4,40: ut Thick cloud............ 172 17°6 } 
' Heated sues : | 
5.10—5.40 | Cloudy .ccsceeceeeses'4 25 °6 ae 
ae W288 29 *4 
5.40—6.10 | Cloudy... cece. lows sate 

* CO; supply increased, previously insufficient, see third reading. 

eww eof 


CO, 
supplied. 
Prelim' 
0 °0183 
0 -0192 
0-0191 
0 0191 
0 0194 
0 -0195 
0 0200 
CO, 
absorbed 
by leaf. 
| 

0 °0180 
0 :0117 
[0 ‘0110 
0 0084: 

0 °0055 


Real 
assimilation |. 
per hour | 
per 50 cm, |, 
00131 
0 ‘0109 

0 0275 
0 0184. 


0-0166] | 
0 -0128 
0 0222 
0 0084 

