342 
DR. MARSHALL HALL ON HYBERNATION. 
Date. 
Temperature of 
the Atmosphere. 
Temperature 
of the Animal. 
January 23 
10 A.M. . . 
• • 42i 
. 
. 421 
— 
1 1 P.M. . . 
. . 401 
. 
. 401 
24 
11 P.M. . . 
. . 43J 
. 
. 431 
25 
10 P.M. . . 
. . 42 
. 
. 42 
26 
10 P.M. . . 
. . 41 
. 
. 41 
27 
10 P.M. . . 
. . 37 
. 
. 37 
28 
11 A.M. . . 
. . 34J 
. 
• 34J 
— 
11 P.M. . . 
. . 37 
• 
CO 
29 
11 A.M. . . 
. . 42 
• 
. 42 
— 
11 P.M. . . 
. . 43 
• 
. 43 
30 
11 P.M. . . 
. . 42 
• 
. 42 
31 
11 P.M. . . 
• • 39J 
• 
. 391 
From this Table it is obvious that the temperature of the hybernating animal 
accurately follows that of the atmosphere. When the changes of temperature 
in the latter are slight, the two thermometers denote the same temperature. 
If these changes are greater and more rapid, the temperature of the animal is 
a little lower or higher, according as the external temperature rises or falls ; a 
little time being obviously required for the animal to attain that temperature. 
Similar observations were made during the first three days of February. 
On the 4th, however, the temperature of the atmosphere rose to 50^° ; that of 
the animal was now 82°, and there was considerable restlessness. On the 6th, 
the temperature of the atmosphere had fallen to 47^°, and that of the animal 
to 48°, whilst there was a return of the lethargy. 
After this period there were the same equal alterations of temperature in the 
animal and in the atmosphere, observed in the month of January. 
It is only necessary to add to these observations, that the internal tempe- 
rature is about three degrees higher than that of the epigastrium. In two bats, 
the external temperature of each of which was 36°, a fine thermometer, with 
an extremely minute cylindrical bulb, passed gently into the stomach, rose 
to 39°. 
The following experiments, made by the celebrated Jenner, illustrate this 
point : 
