CONTENTS. 



Part I. 



Page. 



Introduction 1 



Heat production 1 



Direct and indirect calorimetry 3 



Purpose of the research 3 



Localities for temperature measurement 4 



Natural cavities 4 



Artificial cavities 6 



Surface temperature 6 



Base line in measuring body-temperature 6 



Errors in rectal-temperature measurement 6 



Constancy of rectal-temperature 7 



Factors affecting body-temperature 7 



Part II. 



Methods and apparatus 9 



Comparison of methods 9 



Theory of method of measurement used 11 



Adaptation of method for use 12 



Apparatus used in the research 12 



Constants of the apparatus 12 



Construction of the apparatus 14 



Measuring instruments 14 



Thermal-junction system 17 



Constant temperature oven 20 



Calibration of mercury thermometers 22 



Method of operating apparatus 23 



Calibration of thermal junctions 24 



Computations for the calibration 25 



A sample body- temperature experiment 27 



Computations for the experiment 27 



Precision of measurement 28 



Later modification of the apparatus 30 



Part III. 



Discussion of results 35 



Thermal gradient of the body 35 



Method of studying the thermal gradient 35 



Experimental results 36 



General conclusions with regard to the thermal gradient 39 



The selection of localities for simultaneous measurement of fluctuations in body- 

 temperature 40 



Natural cavities 40 



Temperature measurements in the mouth 40 



Artificial cavities 43 



Simultaneous observations of body-temperature in different localities 44 



Experimental results 45 



Conclusions 72 



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