Killing of Plant Tissue by Low Temper.\ture 



251 



Kind of Root 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 

 plum roots. 



Marianna 



plum roots. 



Marianna 

 plum roots 



Location 



of 



Root 



9 inches below 

 surface 



9 inches below 

 surface 



9 inches below 

 surface 



9 inches below 

 surface 



12 inches be- 

 low surface.... 



9 inches below 

 surface 



Date of F 



1 inch below 

 surface 



Largest 

 Diameter 



. 55 in... 



5 in. 



5 in.... 



.45 in.. 



. 2 in... 



Length 



6 in. 



12 in... 



5 in 



10 in... 



6 in. 



4 in... . 10 in.... 



reezing, M 



1 in. 



2 inches below 

 surface 



2 }^ inches be- 

 low surface... 



2 inches below 

 surface 



6 inches below 

 surface 



4 in. 



arch 24, 1 



14 in... 



8 in. 



Tem- 

 pera- 

 ture 



-10 



-10 



-10 



-10 



-10 

 -10 



913. 



-10 



-10 



3 in... . 



2 in .... 



, 35 in... 



li) in. 



8 in. 



14 in. 



10 

 10 

 -10 



Results 



Cambium i n - 

 jured first 3 

 inches. C a m- 

 bium and cor- 

 tex in remain- 

 der. 



Cambium i n - 

 jured first 3 

 inches. Cortex 

 and cambium 

 next 2 inches; 

 cortex, cam- 

 bium and pith 

 in remainder. 



Cambium and 

 cortex injured 

 very slightly 

 throughout. 



All tissues in- 

 jured. 



All tissues in- 

 jured. 



All tissues in- 

 jured. 



No injury to 

 first 5 inches; 

 slight injury 

 t o cambium 

 next 3 inches; 

 slight injury to 

 cortex in re- 

 mainder. 



Slight injury in 

 cortex and and 

 cambium 

 throughout. 

 More severe 

 towards tip. 



Same as above. 



Same as above. 



Caml)ium and 

 cortex injured 

 throughout. 

 Morf severe 

 last 8 in. Pith 

 last 4 in. 



