166 Measurement of Belief. [CHAP. vi. 



form, the amount of truth which appears to me to be con 

 tained in the assertion frequently made, that the fraction 

 expressive of the probability represents also the fractional 

 part of full certainty to which our belief of the individual 

 event amounts. Any further analysis of the matter would 

 seem to belong to Psychology rather than to Probability. 



