5o6 Journal of Agricultural Research voi. xm, no. io 



ability to resist winterkilling. Turgidity of the tissue as influenced by 

 physiological drouth appears to have more influence than the kind of 

 grain on the concentration of the cell sap. 



On the other hand, for tender plants of the same varieties grown in the 

 greenhouse there appears to be a definite relation between the freezing 

 point of the cell sap, the turgidity of the tissue, and resistance to low 

 temperature. This relation for plants grown in the field perhaps also 

 holds true in the fall and early winter and following periods of mild 

 weather during the winter. 



