30 
BULLETIN 56, HAWAII EXPERIMENT STATION 
CRYOSCOPIC MEASUREMENTS AND OSMOTIC PRESSURE OF THE 
PLANT JUICES 
The method of measuring osmotic pressure of expressed saps based 
on freezing-point depression has been extensively used in studying 
the growth of plants, their adaptability to different environments, 
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Fig. 17.— Sugars in a field of carina during a dormant and an actively growing period 
and the movement of plant fluids in different parts of the organism. 
To learn whether results obtained by this method would substantiate 
the conclusions drawn from the preceding study of the sugars in the 
plant sap, determinations were made of the osmotic pressures of the 
tissue fluids from the rootstocks, stems, and leaves of canna plants, 
using cryoscopic measurements, as outlined by Harris and Gortner 
