102 Corrigendum on Mr F. Y. Edgeworth’s paper. [May 30, 1887. 
minimum deviation. The same principle on which we prefer 
one species of Arithmetical Mean to another is required when 
we choose between the Arithmetical Mean and other genera. 
The comparison between the Arithmetical Mean and the Median 
made at p. 168 of the paper referred to presupposes this principle, 
These considerations produce some softening of the strictures on 
the process described as “assumed inversion” (p. 153 et seq.). 
The writer has attempted to treat the subject with more clearness 
than is admitted by the brevity of this note in a study on the 
Art of Measurement, entitled Metretike (London, Temple Co. 
1887). 
