1910] + REED—TRANSPIRATION AND GROWTH OF WHEAT gI 
and K,SO,. In-the case of CaH ,(PO,),, as shown in table I, there 
is, however, a slight decrease in the units of water required for a unit 
of green weight where the growth response was greater. In the case 
of CaCO, the difference is too slight to warrant any statement one way 
or the other. 
The relations between green weight and transpiration are further 
illustrated by the graphic representation given in figs. 3,4,and 5. To 
construct the curves there shown I selected from each set of experi- 
Fic. 3.—Correlative growth and transpiration in soils to which K,SO, wat 
added; in all charts the continuous line represents green weight, and the broken line 
transpiration. 
mental data an ascending series of green weights. These figures 
ranged, as shown, from a value slightly less than that of the controls 
to a value indicating a growth approximately twice as great as that of 
the controls. The control for each one is represented by roo, there- 
Ore the position of the points above or below too on the chart repre- 
sents the effect of the salt which was added to the soil in that particular 
Series of experiments. 
_ Arranging the figures representing the green weights in an ascend- 
ing order, I let the respective transpiration figures fall as they might. 
