ILLUSTRATIONS. 



Page. 



Fig. 1 . Elementary wiring diagram of apparatus 11 



2. Complete wiring diagram of apparatus 15 



3. Types of thermal-junction thermometers used IS 



4. Details of constant-temperature bath 19 



5. Constant-temperature oven 21 



6. Elementary wiring diagram of modified apparatus 31 



7. Complete wiring diagram of modified apparatus 32 



8. Detachable thermometer for use inside the calorimeter, with connections. 33 

 9-13. Observations on thermal gradient 3G-39 



14. Observations showing rise of temperature in the mouth 41 



15-38'. Temperature curves for experiments 46-71 



V 



