A STUDY IX MO U BID AND N O U M A L PHYSIO LOGY. 7a 



'2d Period — 

 Rise ia animal temperature 1.26 = t. 

 Q = W X t X sp. h. = 15.75 X 1-26 X 0.75 = 14.8837 = heat added to reserve. 



Hourly dissipation of heat 106.1119 



Hourly addition to heat reserve 14.8837 



Hourly production of heat 120.9956 



3d Period— 

 Fall of animal temperature 0.72 = t. 

 Q = W X t X sp. h. = 15.75 X 0.72 X 0.75 = 8.505 == hourly loss from beat reserve. 



Hourly dissipation of heat 105.6299 



Hourly loss from heat reserve 8.505 



Hmirly iiriidiuiinn of heat 157.1249 



itk Period — 

 Rise of animal temperature in three-quarters of an hour 0.36, in one hour 0.48 = t. 

 Q = W X t X sp. h. = 15.75 x 0.48 X 0.75 = 5.G7 = heat added to reserve. 

 Hourly dissipation of heat 149.3977 



Hourly addition to heat reserve 5.67 



Hourly production of heat 155.0677 



SCMM.\Ry. 



Hourly production of heat before section 41.2484 



Hourly production of heat after section : Ist period 1(11.9245 



2d period 120.0956 



3d period 157.1249 



4th period 155.0677 



In studying these experiments it is convenient to examine, first, the question of 

 heat dissipation ; secondly, that of heat production. Tlie h)ss of bodily heat was 

 increased by section in Experiments 5(5, 57, 58, 59. In regard to heat dissipa- 

 tion, section of the higher medulla therefore yields results similar to those caused 

 by division of the spinal cord. In regard to heat production tlie case is different; 

 it is remarkably diminished by section of the cord, but in all the experiments just 

 detailed it was augmented. Thus in Experiment 56 tlie increase was about 27 per 

 cent., in Experiment 57 about 67 per cent., in Experiment 58 about 12 per cent. 

 In Experiment 59, which extended over two days with five distinct measurements, 

 the increase at the different successive periods was respectively 77, 200, 300, 270 per 

 cent. The reasons that in some instances the proportionate rise of heat production 

 was much greater than in others are to be in part looked for in tlie imperfection of the 

 section and in the effects of shock, or of slight bleeding, upon the vaso-motor centres. 

 A point very worthy of notice is, that in several of these experiments no marked 

 rise of the bodily temperature followed the section, the increase of heat dissipation 

 being sufficient to counterbalance the increased production. It would seem, there- 

 fore, that the apparently exceptional cases, in which separation of the medulla from 

 the pons without injury to the vaso-motor centres in the floor of the fourth ventricle 

 is not followed by a rise of the bodily temperature, are not to be considered as really 

 exceptional but only as instances in which heat dissipation is increased proportion- 

 ately to or faster than heat production, so that no accumulation of heat in the body, 

 i. e., no rise of the bodily temperature occurs. 



10 May, 18S0. 



