96 



THE NATURE OF ANIMAL LIGHT 



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CD 



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26 



27 



28 



^ 29 



30 



31 



52 



33 



9.40 9.50 10.00 AK. 



Time in minutes 



Fig. 34. — Curve showing temperature change when two tubes containing water at the 

 same temperature are mixed. 0.1 galvanometer scale division = 0.003° C. Dots represent 

 readings of thermocouple in tube D; crosses readings of thermocouple in tube E. 



solutions came to the same temperature within the ther- 

 mos bottle, this was not necessarily the same as that of 

 the room and a slow rise or fall occurred as indicated 

 by a slow drift of the galvanometer coil. Readings of each 



