THE NATURE OF ANIMAL LIGHT 



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9.40 9.50 10.00 AJ1.. 



Time in iminates 



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 B. 



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 



