Effect of Different Temperatures on the Medusa Cassiopea. 37 



Curve B was plotted from data obtained with a ring whose outside 

 diameter=75 mm.; inside diameter = 3o mm. Its form is essentially 

 that of A, but it is less regular. This must be attributed to experimental 

 errors, as my apparatus for changing the temperature uniformly was not 

 as perfect as in the experiment from which A was plotted, and the ther- 

 mometer used was only graduated to degrees instead of o.i degree. 



160 



150 



140 



130 



120 



110 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 



B 



10 



zo 



10 

 30 40 50C 



160- 



80- 



70- oF 



o 



o 



50 - 



40- 



30- 



-t 



(D 



o 



20- 3 



15 17 19 Z\ a3 25 Z7 29 31 33 35 37 39 4IC 



Temperatures 



FIG. 5. 

 The values of Q for 10 intervals along curve A are as follows: 



So long as the temperature-velocity curve is a straight line, the 

 value of Q 10 will not be constant for all 10 temperature -intervals, but 

 will gradually become less and less, the higher the temperature. This is 

 not the case (as a rule) for temperature-reaction velocity curves. Q 10 



