!»(; 



iiiset'l larvae al crrtaiu i)erio(ls ol" Die year and, 1o a 

 certain extent, of the eold-liardened woody plants. 



Between the lifsl and the second class, Dial is, between 

 the organisms which ai'e killed near the freezing })oint 

 and those which resist some 30^ below zero, there seems 

 to be a colli Innons gradation. 



Jn short, one can perhaps summarize this entire review 

 as follows: With the exception of a few org'anisms which 

 are atifected by above-zero temperatures, all the })lants, 

 animals, tissues or cells either die in the neighborhood of 

 their freezini;' ])()int or are not killed at all by any low 

 temperature. 



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