i(i 



I' i; \- K II. 



Ti«». Tsxr. ort'iiit.T. UrcT*tT«iir. HKMAUKS. 



1:31 r.M. '" '"' '' '■' Rim- 4*^.5 iei one liuur; uverngc lomjicruturf of liot clic>l, 'Jl .10. 



3 Cord cut at fint ilun>ul vurti-bra. 



lul.a 



.1'. 



3:10 ^7.8 



3;1(; ^'.l■.^ liii'.i UiM> 3 .4 ill J hour— an hourly' rutr nf I r. uvir.i"i- i< niit-radire 



of hoi clicst, «9°.3. 



A dop 



EXI'EKIMENT 23. 



liLM.VKK.s. 



Rise of roctal tom|)craliiro, 2 .79; a»'cr!ig« box Icnip. 100.9. 

 Cord cul ill iippiT dorsal rcgioii. 



Ulso of rectui lonipcratiiro, 1°.8 j ovorug'u l)o.\ IcinpiTalurc 101<'.l. 



KxrEKLMEXT 24. 



ItK.MAItKS. 



Risp of rectal temperature, 1 .2 ; average bos loinj>cralurc, 99^. 

 Cord cut ill upper dorsal region. 



Ri.so of rectal temperature, iP.9; average box tenipemlure. 98°.8. 



Ill lookiiifT over those t'xpcrimcnts it will be seen that in the first the rise of the 

 rectal teiiiperature was nearly 2°.5 in an hour, before section of cord, but that after 

 the operation the rertal fcnipciature fell (r.2o, altliouj^h the surronn(liii<; air was 3^ 

 warmer after than before the division of the cord. In the second ex|)erinient the 

 rectal temperature rose practically at the same rate after and before divi.sion of the 

 cord, althoti^'h the surrounding temperature was over 5° lower after than before the 

 section. In the third experiment in atmospheres of equal heat, before section the 

 rectal temperature rose almut one-half more than it did after section ; wliil>t in tlielast 

 trial tile rise was double after section, althoui^h the surroundini; temix-rature was less. 



Tliese experiments, taken in conjunction with those of Binz, Naunyn and Quincke, 

 Parinaud, etc., lead to the conclusion tliat usually the animal heat rises faster in 

 n hot atmosphere after than before section of the cord, but that in some cases 

 the reverse occurs, .\ecording to my experience the stronger the animal the more 

 probability there is of an excessive rise after division of the spinal cord. 



^'arinus theories have been propounded to account for the changes of temi)cra- 

 ture which follow section of the spinal cord. Any one of these theories may or 

 may not be correct, all of them resting upon merely deductive reasoning, and no one 

 of them having been demonstrated. Indeed up to the ])resent moment, the prininry 

 question — Is the first fall of temperature due to a lessened production, or to on 

 abnormal throwing off, of bodily heat? — really remains unanswered. It is to 

 solve this problem that the next scries of experiments, recorded in tliis chnptcr, 

 wi-re attempted. 



Acroriling to Lavoisier {Ehmrnls nf CJmvisfri/, Kobt. Kerr's Translnfion, p. 343, 

 Kdinbiiri:h, \VM)) the first yrrsim to mak«- :ui iiistninieiit to measure heat given 



