Killing of Plant Tissue by Low Temperature 



i6i 



It will be seen from these tables that by taking an average of a 

 large number of these freezings, the percentage of killing is uniformly 

 lower when the depression is increased. 



Shaded Zea Mays seedlings were watered with .0804 N potas- 

 sium chloride, and others with water with results as follows: 



Table 2. Showing Effect of Watering With Mineral Solu- 

 tions ON Sap Density and Hardiness of Shaded 

 Zea Mays Plants. 



The following table gives results of freezing cowpea seedlings 

 that had been watered with solutions containing 6.03% normal 

 potassium chloride, sodium chloride, magnesium chloride, ammonium 

 chloride, sodium nitrate, and distilled water. 



