LIST OF TABLES 



Table 1. — Some thermal properties of water and several elements and compounds 4 

 Table 2. — Physical properties of water and some other common liquids ... 4 



Table 3. — Characteristics of molecular interaction 20 



Table 4. — Contributions of the three constituents of the van der Waals forces to 



intermolecular forces in the liquid state 21 



Table 5. — Osmotic pressures of sucrose solutions at constant temperature . . 32 



Table 6. — Influence of temperature on osmotic pressure 32 



Table 7. — Comparison of osmotic and gas pressures 33 



Table 8. — Observed and calculated osmotic pressure values for sucrose solutions at 



30° C 34 



Table 9. — Osmotic pressure of cane-sugar solutions at 20°C; observed and cal- 

 culated values 35 



Table 10. — Calculated hydration numbers for sucrose solutions at various tempera- 

 tures and concentrations 36 



Table 11. — Osmotic pressure of solutions of cane sugar at 30°C 37 



Table 12. — Osmotic pressure of sucrose solutions at 0°C 37 



Table 13. — Observed and calculated osmotic pressure values for sucrose solutions 



at 30°C 38 



Table 14. — Observed and calculated values of the osmotic pressure of sucrose 



solutions 3S 



Table 15. — Observed and calculated values of the osmotic pressure of a-methyl 



glucoside solutions 39 



Table 16. — Observed and calculated values of the osmotic pressure of calcium 



ferrocyanide solutions at O'C 39 



Table 17. — Volume of weight-normal solutions of cane sugar at 0°C . . . . 47 

 Table 18. — Relation between relative humidity, vapor pressure, and diffusion pres- 

 sure deficit of atmospheric moisture at 20°C 56 



Table 19. — Water content, in per cent of fresh weight, of some common food 



materials 62 



Table 20. — Walls of the phloem of potato stolon expressed as percentage of total 



cross section of the phloem 65 



Table 21. — Measurement of adhesion pressure in Beta vulgaris root 84 



Table 22. — Longitudinal strips of beetroot (Futterriibe) 14 cm. long, soaked for 



various times in water, then overnight in 0.5M KNO3 84 



Table 23. — Effect of water saturation on Og values 84 



Table 24. — Isotonic coefficients of various salts calculated on a weight molar basis 86 



Table 25. — Change in volume of potato tuber tissue cylinders immersed 8 hours in 



sucrose solutions of varying concentration at 20°-22°C. Values are based on 



normal volume 98 



Table 26. — Changes in surface dimensions of epidermal strips from Sedum nicaense 



leaves. Values are arbitrary units 98 



Table 27. — Osmotic pressure of various tissues determined plasmolytically, expressed 



as mols of KNO3 per liter of solution 100 



Table 28. — Effect of varying soil moisture supply upon the DPD of plant tissues 106 

 Table 29. — Osmotic quantities in the hypocotyl of Helianthus annuus seedlings, 



determined at normal volume 106 



Table 30. — Cryoscopic and plasmolytic measurement of osmotic pressure in vari- 

 ous plants 112 



Table 31. — Description of beets employed in PCD determinations, and periods dur- 

 ing which tests were made 115 



Table 32. — Summarized results of plasmolytic and cryoscopic tests on various lots 



of beets 116 



Table 33. — Results of deplasmolysis and replasmolysis tests on beetroot tissue. 



Atmospheres at 22.5°C 116 



Table 34. — Comparison of osmotic pressure values determined plasmolytically and 

 those determined cryoscopically on various fractions of expressed leaf sap . .118 



