Killing of Plant Tissue by Low Temperature 



193 



room in a few minutes. In no case was there any evidence that the 

 rate of thawing aflfected the amount of injury to the unripe fruit, 

 or even to the partially ripe Yellow Swan peaches. It seems proba- 

 ble that slow thawing affects the amount of injury to fruits only in 

 case of ripe apples and pears. 



The following table gives the results of slow and rapid thawing 

 of some garden plants: 



Table. 17. Showing the Effect of Slow and Rapid Thawing 

 ON Leaves and Stems of Growing Plants. 



Material 



Manner 



of 

 Thawing 



Cowpeas 



Cowpeas 



Cowpeas 



Cowpeas 



Cowpeas 



Lettuce 



Lettuce 



Lettuce 



Lettuce 



Lettuce (Black 



Seeded Simpson) 

 Lettuce (Black 



Seeded Simpson) 

 Lettuce (Black \ 



Seeded Simpson)i 

 Lettuce (Black 



Seeded Simpson) 



Kale 



Kale 



Kale 



Kale ; 



Kale, ' 



Kale 



Kale 



Cabbage 



Cabbage 



Red Cabbage 



Red Cabbage 



Cabbage, 



Flat Dutch 



Cabbage, 



Flat Dutch 



Cabbage 



Cabbage 



Cabbage 



Date 



Tem- 

 pera- 

 ture 



Rapidly in room. May 28 

 Slowly in freezer May 28 

 Rapidly in sun. . May 28 

 Rapidly in room. June 14 

 Slowly in freezer. June 14 

 Rapidly in room. May 7 

 Slowly in freezer. May 7 

 Rapidly in room. May 13 

 Slowly in freezer. May 13 



Rapidly in room. June 12 



Slowly in freezer. June 12 



Rapidly in room. June 12 



Slowly in freezer. June 12 

 Rapidly in room. May 15 

 Slowly in freezer. May 15 

 Rapidly in room. June 28 

 Slowly in freezer. June 28 

 Rapidly, fanned. June 28 

 Rapidly in room. July 3 

 Slowly in freezer. July 3 

 Rapidly in room. May 15 

 Slowly in freezer., May 15 

 Rapidly in room. May 15 

 Slowly in freezer May 15 



1 

 Rapidly in room. June 12 



Slowly in room. . June 12 

 Rapidly in room. June 28 

 Slowly in freezer. June 28 

 Rapiilly, fanned., June 28 



'131 -3.8 

 '13] -3.8 

 '13 -3.8 

 '13 -4 

 '13 -4 

 '13j -4 

 '13 

 '13 

 '13 



'13 



'13 

 '13; 

 '13 

 '13| 

 '13 

 '13 

 13 

 '13 

 '13 

 13 

 '13 

 '13 



-4 

 -4 



'13| -4 



I 



'13 -4 



-4 



-5 



-5 



-3, 



-3, 



-3.5 



-3.5 



-3.5 



-5 



-5 



-5 



-5 



13 -4 



'13 



13; 



13, 

 '13; 



Per- 



Num- cent- 

 ber of : age 

 Leaves all 



Killed 



12 



26 



25 



3 



3 



27 



20 



4 



3 



11 



10 



10 

 6 



5 

 5 

 5 

 5 

 5 

 5 

 4 

 4 

 5 

 9 



25 

 100 

 100 

 100 



22^2 

 5.0 



66.6 

 36.6 



Per- 

 cent- 

 age 

 Total 

 Sur- 

 face 

 Killed 



100 

 90 

 37 

 13 

 90 

 50 



92 



50 



90.0 ! 97.5 



90. 



16. 



0. 



100, 



100, 



100, 



80, 



80, 



100, 



100, 



20, 



33. 



97.5 



20.8 



0.0 



100.0 



100.0 



100.0 



95.0 



95.0 



100.0 



100.0 



20.0 



33.3 



20 100.0 100.0 



10 100.0 

 5 

 5 



100.0 

 40.0 85.0 

 40.0 ! 85.0 

 40.0 85.0 



