504 



ON INCREASE IN SIZE 



[PT. Ill 



Here 1-128 is the temperature coefficient for 1° (in the common 

 terminology Q.i) but, as it is usual to employ the expression Q,io ^.s 



24.0 23° 22° 21° 20° 19° 18° 17° \&°- 15° 14° 13° 12° 11° 10° 9° 8° 7° 6° 5° 4° 3° 2° 1° 



Fig. 76. 



the temperature coefficient, the value for the frog is 1-128^°, i.e. 

 3-34, or, in other words, the time taken to reach a definite stage at 

 20° multiplied by 3-34 will give the time taken to reach the same 



