206 



Mr. J. M. O'Connor. 



32 37 28 



Fig. 3.— Cat, 1950 grin. 



A. Abscissa, rectal temperature. Ordinate, 2 consumption per 10 minutes. 



B. Abscissa, skin temperature. Ordinate, extra oxygen per 10 minutes. The four 



upper j>oints are obtained after having been warmed. . . 



Fig. 4. — Cat, 1250 grm. As fig. 2. x indicates observations when shivering before 

 being warmed. + , shivering after having been warmed. 



In both these experiments the 2 consumption on cooling rose distinctly during the 

 period just before shivering commenced. This is not an invariable occurrence, and is 

 omitted from the graphs. 



The correctness of the theory based on these experiments is supported by the fact that 

 it occasionally happens at the beginning of an experiment an animal does not shiver 

 until its rectal temperature has fallen to the point to which it is later found to regulate. 

 This can be seen in the illustrative protocol at the end of the paper. 



