424 Dr. F. F, Blackman and Miss G. L. C, Matthaei. [Apr. 11, 
uoIge|IWISsSy 
Si 
"299 sWWeUZIIIIU SsYyqueg 

Fig. 4. 
The heavy line connects the successive leaf-temperatures ; the light line the corre- 
sponding bath-temperatures. The horizontal lines of dots indicate the assimilation in 
successive hours. 
Both the temperature-curves show fluctuations according as the sun is clear or clouded, 
but these are much more violent in the leaf than in the large mass of water in the bath, 
which is continually being replaced by running water of fairly uniform temperature. 
From inspection of the graphic record of the bath-temperature, one can learn when the 
sun was shining and when clouded; from the graphic of the leaf-temperature a more 
detailed reconstruction of the sequence of illumination is possible, while the difference 
between the two temperatures gives information of considerable precision about the 
intensity of illumination ; this is used in Tables I and II. 
Table L—Experiment VI. 



| No. Excess Observed Maximal Deficiency 
of estima-| Hour. |temperature leaf- assimilation for Observed of observed 
| : Pp observed assimilation. aeagete) 
tion. of leaf. | temperature. temperature assimilation. 
eae al 10 4°3 23:5 0 -0106 | 0-0092 ~14 
| 2, 11 3 °6 2362 0 0104, | 0:°70095 | — 9 
| 3 noon 4-1 23 °8 0 -0108 0:0102 | — 6 
| 4 1 1°9 21 °4 O :0093 0 :0071 | — 22 
| 5 2 6 °4: 26 ‘9. 0 °0127 — 0°0108 | —19 
6 3 56 26 °3 0 0123 0-0093 | — 30 
7 4 | 2°0 21 °8 0 :0095 0 -0061 | — 34 
8 5 | 15 21 °5 0 0094 0:0054 =| — 40 
9 6 0°6 20 °2 0 0086 0 :0041 | —45 



