62 



20° F. to 30° F. below zero with but slight injury where the tempera- 

 ture fall is not so rapid. No fruit buds have been found on the 

 Experiment Station grounds that can not be killed by a temperature 

 secured by salt and ice when in the most dormant state, by very rapid 

 fall. The following is a list of the freezings in our laboratory, with 

 the results: 



Table 20. Showing Effect of Slow and Rapid Temperature 

 Fall on Freezing to Death of Plant tissue. 



Kind of Buds 



Date 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Num- 

 ber 

 Buds 



Percent- 

 age 

 Killed 



Slowly to -19.5° C. 



Rice's Seedling peach . . . 



Yellow Swan peach 



Early Richmond cherry, 



Rice's Seedling peach . . , 



Yellow Swan peach 



Early Richmond cherry, 

 Dyehouse cherry 



Rice's Seedling peach. . . 



Elberta peach 



Jonathan apple 



Montmorency cherry. . . 

 Lombard plum 



Hills Chili peach 



Rice's Seedling peach . . , 

 Early Richmond cherry. 



Elberta peach 



Hills Chili peach 



Rice's Seedling peach. . . 



Rice's Seedling peach. . . 



Elberta peach 



Jonathan apple 



Montmorency cherry. . . 

 Chabot plum 



Jan. 25,'13 

 Jan. 25/13 

 Jan. 25, '13 



Feb. 

 Feb. 

 Feb. 

 Feb. 



Slowly to -20° C. 



10.3 

 30.5 

 45.0 

 22.9 



Slowly to -18.5° C. 



42.3 

 97.7 

 34.3 

 14.1 

 12.9 



Slowly to -15.5» c. 



Feb. 

 Feb. 

 Feb. 



22, '13 

 22,'13 

 22,'13 



63 



104 



94 



17.3 

 10.6 

 29.8 



Slowly to -18° C. 



Mar. 8,'13 

 Mar. 8,'13 

 Mar. 8,'13 



66 



120 



70 



30.3 

 20.8 

 21.4 



Slowly to -18° C. 



Mar. 22/13 

 Mar. 22/13 

 Mar. 22,'13 

 Mar. 22/13 

 Mar. 22/13 



138 

 100 

 34 

 176 

 236 



44.2 

 88.0 

 64.7 

 58.5 

 78.3 



Rapidly to-17.7°C. 



55 

 86 

 90 



96.4 



100.0 



97.7 



Rapidly to -19° C. 



68 

 64 

 89 

 90 



100.0 



100.0 



98.8 



97.6 



Rapidly to -12° C. 



101 

 86 

 20 

 87 

 99 



37.6 

 61.6 

 70.0 

 17.2 

 47.3 



Rapidly to -10° C. 



49 

 81 

 73 



10.2 



4.9 



54.8 



Rapidlyto-13.5°C. 



92 

 71 

 82 



70.6 

 76.0 

 54.9 



Rapidly to -13.5° C. 



154 



85 



33 



184 



183 



51.9 

 92.9 

 75.7 

 .62.5 

 86.8 



