Ill] 



OF TEMPERATURE COEFFICIENTS 



227 



From inspection of this diagram, we see that the time taken to 

 attain certain stages of development (denoted by the numbers 

 III-VII) was as follows, at 20° and at 10° C, respectively. 



Total 



16-7 



55-6 



25'C. 20° 15° 10° 5' 



Fig. 66. Calculated values, corresponding to preceding figure. 



That is to say, the time taken to produce a given result at 10° 

 was (on the average) somewhere about 55-6/16-7, or 3-33, times as 

 long as was required at 20° C. 



We may then put our equation in the simple form, 



x^^ = 3-33. 

 Or, 10 log X = log 3-33 = 0-52244. 



Therefore log x = 0-05224, 



and X = 1-128. 



