48 



TABLE II. 

 NOB. Temperature of Animals. Duration of Life. 



1, . 38 Cent, (about 101 Fahr.) . 15' 



2, . 30 " 86 " . 24' 



3, . 22 " 77 " . 47' 



Between No. 1 and No. 3 the difference of temperature was 

 16 Cent. (29 Fahr. ;) the difference in the duration of life was 

 thirty-two minutes that is, two minutes for each diminution of 

 one centigrade degree (nearly 2 Fahr.) 



Experiment 3. I put a ligature around the trachea of four 

 cur-dogs of the same brood, and aged three days. 



TABLE III. 

 Nos. Temperature of Animals. Duration of Life. 



1, . 37 Cent, (about 99 9 Fahr.) , 13' 



2, . 28 " 83 " . 19' 



3, . 24 " 76 " . 31' 



4, . 19 " 67 t: . 51' 



So that between the two extremes the difference as the dura- 

 tion of life, was 38 for 18 Cent, (about 32 Fahr.) 



Many other experiments on very young dogs gave very nearly 

 the same results. 



Experiment 4. On five cats, of the same brood, and aged two 

 days, I put a ligature around the trachea, after having cooled 

 three of them. 



TABLE IV. 



Temperature of the animals. Duration Mean 



NOB. of life. duration. 



1, 36 Cents., (about 97 Fahr.) 21' \ , 



2, 36 97 30 f 



3, 23 to 24 Cent., (74 to 76 Fahr.) 47 1 '' 



4, 22 to 23 Cent., (72 to 75 Fahr.) 50 j 2 , 



5, 17 Cent., (about 63 Fahr.) 53 

 The temperature of the air air was then at 18 1 Cents., (65 Fahr.) 



Experiment 5. On four mice, probably aged from three to 

 eight days, I put a ligature around the trachea after having 

 cooled three of them. 



TABLE V. 



NOB. Temperature of the animals. Duration of life. 



1, 34 Cents., (about 94 Fahr.) 11' 



2, 27 " 81 ' 14 



3, 22 " 72 10 



4, 18 " 65 14 



I have obtained analogous results in experimenting on birds. 



