¥ iP NINETEENTH REPORT STATE ENTOMOLOGIST OF MINNESOTA—I9Q22 
In Figure I, temperature curves are plotted for the freezing of 
bugs Nos. 1 and 2, and since the temperature curves for the remaining 
bugs are very similar, these latter are omitted to prevent a confusion 
of lines on the graph. The dotted line shows the temperature of the 
air as recorded by a thermocouple placed at about three-sixteenths 
of an inch to one side of No. 1. This curve indicates that sufficient 
heat is given off during crystallization to raise the temperature of the 
air in the immediate vicinity of the bug. Similar changes in tempera- 
ture at the moment of freezing, as recorded by the air couple, were 
noted in the freezing of other bugs, the amount depending on the dis- 
; MINUTES, 
C | ee eae es ae es ee chen ie 
Fig. 1. The heavy lines are temperature curves for the freezing of bugs Nos. 1 and 2. The 
dotted line gives temperature of the air as recorded by a thermocouple placed at about 
three-sixteenths of an inch to one side of bug No. 1. This curve indicates that heat 
was given off by the bug at the moment of freezing which was sufficient to raise the 
temperature somewhat in the immediate vicinity of the bug. 
