Water in Plants 



XXI 



List of Tables 



Table 35. — Efifect of killing tissue on the osmotic pressure of expressed sap . .119 

 Table 36. — Comparison of saps expressed from living and killed tissue .... 120 

 Table 37. — Osmotic pressure of sap expressed from living vs. killed (by heat) 



leaves 120 



Table 38. — Osmotic pressure of sap expressed from living as against dead (frozen) 

 tissue, comparing tvi^o types of beets. Values in atmospheres at 22.5 °C . . . 122 



Table 39. — Plasmolysis of beet cells in their own sap 123 



Table 40. — Osmotic pressure determinations of tissue cylinders and of their equi- 

 librium bathing solutions. Atmospheres at 22.5°C 126 



Table 41. — Cryoscopy of sap expressed from several marine algae and of the sur- 

 rounding sea water. Atmospheres at 20° C 127 



Table 42. — Osmotic pressures of cell sap from cotton seeds of three ages before and 



after immersion in sucrose solutions 132 



Table 43. — Freezing points of living tissue, dead tissue, and expressed sap. At- 

 mospheres at 22.S°C 134 



Table 44. — Summary of investigations on rate of sap movement in plants . . . 169 

 Table 45. — Transpiration of Solidago virga aurea in milligrams per gram fresh 



weight per minute. Cut surface renewed hourly 185 



Table 46. — Ratios between internally exposed cell walls and external leaf surface 195 



Table 47. — Water requirement in Zca as affected by nutrition 198 



Table 48. — The effect of decrease in water content on the amylolytic activity and 



starch dissolution of sunflower leaves kept in the dark for 18 hours 202 



Table 49. — Influence of water absorption on meiosis in Oenothera 203 



