1910] REED—TRANSPIRATION AND GROWTH OF WHEAT 93 
large. In the lower part of the figure, where the green weight is near 
100, the two curves lie closer together and more nearly parallel than 
in the upper part of the figure. From these relations it appears that 
the transpiration per unit of green weight is smallest when the accel- 
eration of growth caused by the application of K,SO, was greatest. 
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- §-—Correlative growth and transpiration in soils to which CaCO; was added. 
Fig. 4 shows curves constructed in a similar way to show the 
action of sodium nitrate upon green weight and transpiration. As — 
before, the numerical values representing the green weight of the 
Various experimental plants are arranged in an ascending series. 
The curve representing the transpiration of the plants is somewhat 
More irregular than in the case of the K,SO, experiments, yet its 
“ean position lies somewhat below the green weight curve. This 
*S Interpreted to mean that the transpiration of plants grown in pots 
