A STUDY IN MORBID AND NORMAL T II Y S I () L () (J Y. 39 



Carhonic. xiciil. 

 Before Section. 



0.0147j X 1341.3 = 1'J.7'J.S4 grammes = CO^ leaving box. 

 0.002:^:") X 92-2.G = 2.()7.")S grammes = CO^ cutering 1ju.v. 



Hourly production of VO^ 17. 722G grammes. 



Aftee Section. 



0.0138 X 1325.7 = 18.2946 grammes = CO, leaving box. 

 0.00525 X 411 = 2.1577 grammes = CO, entering box. 



Hourhj iiruduclkm (/CO^ 10.13(i'J grammes. 



SUMMAUY. 



17.7226 grammes = hourly CO, production before .section. 

 16.1360 grammes = hourly CO^ proJuclion after section. 



Decrease of QO., production fnUowing section 1.5857 



In studying Experiment 32, the feature which lir.st attracts attention i.s tlic 

 smallness of the liourly dissipation of heat. Tliis evidently was dependent \\\)o\\ 

 the excessively thick coating of very long hair which covers the Spitz d(jg, 

 and which must interfere in a very great degree with the throwing off of heat. 

 After section of the cord there avus a reduction instead of an increase in the dissi- 

 pation of heat. I cannot help believing that the excessive coating of hair played 

 an important part in the production of this anomalous result. In Experiment 33, 

 the diminution of heat dissipation only amounted to about 8 per cent. It will be 

 noted that the cord \\ as cut very low down, below the origin of the splanchnic nerves. 

 The discussion of the cause of the discrepancies between the results of these two 

 experiments, and those previously obtained, will be best carried out, after the 

 consideration of the causes of the increased heat dissipation, which usually follows 

 section of the cord. What then is the cause of this increased loss of heat 



Tscheschichin, in his experiments {op. cit., pp. lo-t, 177), found that after 

 section of the cord the temperature in the interior of the body sank more rapidly 

 than that of the external parts; thus, in one experiment, the mercury in two ther- 

 mometers, which had their bulbs respectively in the intestines and underneath the 

 skin of the animal, differed before the operation in height eight-tenths degree F., 

 whilst some time after the operation they or.ly differed one-tenth degree F. 



I have performed and reported elsewhere (A Stud// of the Nature and Mcclmnism 

 of Fever) a single experiment in which the surface did not maintain its temperature 

 more persistently than did the deep tissues. But in the recent elaborate studies 

 of Henri Parinaud the researches of Tscheschichin have been substantially con- 

 firmed. Observations were made with thermometers placed in the rectum, axilla, 

 and groin, and upon the surface of the front and hind feet. It was found that after 

 section of the cord both the rectal temperature and that of the deep parts of the 

 paralyzed portions of the body as measured in the groin or axilla always fell, but 

 the surface temperature underwent a distinct primary transient rise. Section of 

 the cord undoubtedly paralyzes the vaso-motor nerves and dilates the bloodvessels; 

 it makes, therefore, the ways of communication between the outer and inner portions 

 of the body more open and free, and places more upon a level of temperature the 



