AND ANIMAL LIFE. 23 



animal temperature is affected, not from the 

 want of oxygen, agreeably to his opinion, but 

 from the inefficiency of this to act on an aug- 

 mented quantity of blood. The truth of this 

 view is proved, according to my reasoning, in 

 the circumstances connected with the latter part 

 of the above sentence which I have quoted. 

 When the animal made struggles, LEGALLOIS ob- 

 served that the quantity of oxygen consumed 

 was greater than usual at the time that the 

 temperature was falling rapidly, and he con- 

 jectures that a portion of the heat was carried 

 off by these efforts. If LEGALLOIS had reflected 

 on this subject, he would have perceived the 

 evident fallacy of this explanation. In every 

 case of muscular exertion, accompanied by an 

 increased consumption of oxygen, heat is gene- 

 rated ; and although this may be carried off 

 more quickly, and to a greater extent than when 

 the body is at rest, still these conditions are not 

 sufficient to counterbalance the quantity which 

 is generated. 



XXX. From the nature of the greater part 

 of the experiments I have performed on animal 

 heat, I have had every opportunity of verifying 

 the preceding remarks, and I have always found 

 the character of the respiration and the action of 

 the heart as stated in XXIX. Among the num- 

 ber of rabbits which I kept in the rooms appro- 

 priated to experiments, there was one which had 



