OSMOTIC PRESSURES AND ELECTRICAL CONDUCTIVITIES 167 



ILEX AQUIFOUUM. Mature Leaves. 

 FIG. 21 A. 



The full-line curves show the depressions of freezing-point and osmotic 

 pressures produced by the total solutes, carbohydrates, and electro- 

 lytes of leaves of an evergreen treated with liquid air. The dotted 

 line represents the values of A for untreated leaves gathered in 

 a previous year. Since the leaves employed were all of the same 

 age, there is no rise in their electrolyte content as the season advances. 



