4 8 



Table 13. Showing Percentage of Proteids in Frozen and 

 Unfrozen Sap From Succulent Plants. 



In case of cabbage, kale, lettuce and peas there is some evidence 

 of precipitation in case of the more tender greenhouse plants, but 

 it is possible that the differences are within the range of experimental 

 error. 



In March, 1913, apple roots that had been growing in the green- 

 house for sixty days had sap expressed, half of it frozen to a tempera- 

 ture that would kill them, the other half not frozen. At the same 

 time sap was taken from roots that had been kept in cold storage 

 at a temperature seldom varying from 3 2° F., with the following results : 



Table 14. Showing Percentage of Proteids in Frozen and 

 Unfrozen Sap From Apple Roots. 



