1911] LIVINGSTON—LIGHT INTENSITY AND TRANSPIRATION 433 
TABLE VI 
COEFFICIENTS OF CORRECTION 
Test IV Brown atmometer Black atmometer 
Physal. Xanth. Martyn. Physal. Xanth. Martyn. 
Ist sun exposure ... 1.38 T.09 0.99 1.38 1.09 0.99 
2d sun exposure.... xuRs 1.26 0.07 1.46 1.21 0.93 
etieRe ces. 1.46 | 1.18 0.98 | I.42 Se 0.96 
White atmometer | Integrator 
Physal. Xanth. | Martyn. | Physal. | Xanth. | Martyn. 
Ist sun exposure ... ae 1.58 1.43 0.43 0.34 O.47 
2d sun exposure.... 4,23. {+2 7208 120 0.69 0.57 0.44 
Pomtage 2k a. k. 1.61 1.63 | 1.36 0.56 | 0.46 | 0.38 
“Solio” paper : Wynne paper 
Physal. | Xanth. | Martyn. | Physal. | Xenth. | Martyn. 
Ist sun exposure ...|- 0.21 0.16 O.t5 0.43 | 0.34 0.31 
2d sun exposure....| 0.25 0.21 0.16 0.51 0.43 0.33 
nbhee: 2 Scan 0.23 0.18 0.15 0.47 | 0.30 | 0.32 
Black thermometer 
Physal. Xanth. Martyn. 
Ist sun exposure...| 0.40 0.31 wild 
2d sun exposure ...| 0.49 0.40 @.3f 
Bverase 2 0.45 0. 36 0.39 
Finally, in table VII are brought together all the average coef- 
ficients from the preceding tables, together with their averages, for 
each plant for the whole investigation. This second average gives 
Us a Coefficient that may be taken to represent each instrument 
with reference to each plant. The average of the three different 
coefficients thus obtained for each instrument is given in the last 
column of the table. The latter average may perhaps represent 
the correction to be applied to each instrument for plants in general. 
Of course the latter statement is a pure assumption, based on the 
