Killing of Plant Tissue by Low Temperature 



169 



Roots 24 hrs. in solu- 

 tions of strength meas- 

 ured by freezing points 

 given below 



CABBAGE 



(later freezing) 



No treatment 



Potassium Chloride 



(.775) 



Glycerine (2.82)..... 

 Ammonium Chloride 



(.360) 



Date 



July 1,'13 



July 1,'13 



July 1,'13 



July 1/13 



COWPEAS 



Cane Sugar (1.570). . . . Sept. 1 



Glucose (1.740) Sept. 1 



Glycerine (1.575) .Sept. 1 



Potassium Chloride ! 



(0.730) .Sept. 1 



Ammonium Chloride 1 



(0.725) jSept. 1 



Water iSept. 1 



Cane Sugar (1.570). ... iSept. 9 



Glucose (1.740) ISept. 9 



Glycerine (1.575) Sept. 9 



Potassium Chloride I 



(0.730) 'Sept. 9 



Ammonium Chloride ! 



(0.725) Sept. 



Water Sept. 



Cane Sugar (1.570). . . . Sept. 



Glucose (1.740) Sept. 



Glycerine (1.575) Sept. 



Potassium Chloride 



(0.730) _. Sept. 9 



Ammonium Chloride 



(0.725) Sept. 



Water iSept. 



Cane Sugar (1.570). . . . lAug. 



Glucose (1.740) ;Aug. 



Glycerine (1.575) |Aug. 



Potassium Chloride 



(0.730) Aug 



Ammonium Chloride 



(0.725) 



Aug. 

 Water |Aug. 



9 



9 



29 



29 



29 



29 



29 

 29 



'11 

 '11 

 '11 



'11 



'11 

 '11 

 '11 

 '11 

 '11 



'11 



'11 

 '11 

 '11 

 '11 

 '11 



Tem- 

 pera- 

 ture 



-4.0 



-4.0 

 -4.0 



-4.0 



-3.0 

 -3.0 

 -3.0 



-3.0 



-3.0 

 -3.0 

 -3.0 

 -3.0 

 -3.0 



-3.0 



-3.0 



-3.0 

 -3.5 

 -3.5 

 -3.5 



'111 -3.5 



'11 



'ir 



'11 

 11' 



-3.5 



-3.5 



-3 



-3 



-3 



'11 -3.0 



'11 

 '11 



-3.0 

 -3.0 



Number 



of 

 Leaves 



5 

 5 



3 

 3 

 3 

 3 

 3 



3 

 3 

 3 

 3 

 3 



3 

 3 



Percent- 

 Age 

 Killed 



80.0 



40.0 

 20.0 



100.0 



Cane Sugar (1.570), average 



Glucose (1.740), average 



Glycerine (1.575), average 



Potassium Clilorirlc (0.730), average.. 

 Ammonium Chloride (0.725), average 

 Water, averiige 



0.0 



100.0 



0.0 



100.0 



66.6 

 33.3 



0.0 

 33.3 



0.0 



0.0 



33.3 

 100.0 



0.0 

 66.6 



0.0 



66.6 



66.6 



33.3 



0.0 



0.0 



0.0 



100.0 



0.0 

 100.0 



0.0 



49.9 

 0.0 

 66.6 

 41.6 

 06.6 



Percent- 

 age 

 Killed 



and 

 Partly 

 Killed 



100.0 



100.0 

 80.0 



100 



0.0 



100.0 



0.0 



100.0 



66.6 

 33.3 



0.0 

 66.6 



0.0 



0.0 



100.0 

 100.0 



0.0 

 66.6 



0.0 



66.6 



66.6 



33.3 



0.0 



0.0 



0.0 



100.0 



0.0 

 100.0 



0.0 

 58.3 



0.0 

 66.6 

 58 . 3 

 66.6 



De- 

 pres- 

 sion 



.780 



1.145 

 1.780 



.950 



1.230 

 1.250 

 1.160 



1.130 



1.140 

 .870 

 1.230 

 1.250 

 1.160 



1.130 



1.140 



.870 

 1.230 

 1.250 

 1.160 



1.130 



1.140 

 .870 

 1.230 

 1.250 

 1.160 



1.130 



1.140 

 .870 



1.230 

 1.250 

 1.160 

 1.130 

 1.140 

 .870 



