A STUDY I N M O 11 B 1 D A N D A () II .M A 1. 1" 1 1 V h i U i. U (j V. 



41 



EXPEUIMENT ;U. 



This experiment i.s a eoiitiiiuution of Experiinciit 2(). 



Heat D'bsmpadon. • 



Quantity of air (V) = 171.9072 at 780.06—32° = 40.0(; = t'. 



V + (V X t' X 0.002035) = v. Y = I'J-iOJ^ ^ -^_,^_^ W = Y X 0.08073 = 12.68 



1.0937 

 Rise ill tonip. of air 5.65 = t. Q = A\' X t X sp. h. = 12.68 X 5.65 X 0.2374 = 1 7.0078 = heat given to air. 

 Rise in temp, of water 1.4 X 1G4.1414 = 229.798 . = heat given to calciimcter. 



17.0078 = heat given to air. 



246.8058 = heat dissipatcil in 2 lionrs. 

 Hourly dissi'iialion of heat 123.4029 



In comparing the dissipation of heat here recorded with what was yiekled before 

 and immediately after section (see page 29), we arrive at the following: — 



Before section, hourly dissipation of heat 



Forty-eight honrs after section, hourly dissipation of heal 



204.7554 

 12.3.4029 



Diminzshed hotirli/ hcai d/'ssipat/on in second pen'od nfltr seclioii of curd 81.3525 



Immediately after section, hourly dissipation of heat .... 295.1511 



Forty-eight hours after section, hourly dissipation of heat . . . 123.4029 



Diminished hourly dissipation in second period as compared xottU fu-U 



period after section .......■•• 172.i4C2 



This experiment, taken along with others previonsly discussed, proves that after 

 section of the cord heat dissij^mtion is usually first increased and afterward dimin- 

 ished. The late diminution of heat dissipation, the temp(>raturc of the animal 

 remaining at normal or below it, shoAvs that there is diminislied lieat production 

 some hours after the section of the cord. The question offers itself, whether, directly 

 after section of the cord, when the dissipation of caloric is abnormally great, the 

 heat production is increased or diminislied? In answering this question, it is 

 necessary to remember that all heat dissipated but not produced in a certain period 

 must be obtained by a lowering of the temperature of the body which gives it off. In 

 determining whether the increased dissipation, which follows spinal section, is solely 

 at the expense of the accumulated heat of the body, or whether it is obtained in part 

 by an increased production of heat, it is evidently necessary to know tlic absolute 



Ij April, 1880. 



