HIS PHILOSOPHICAL POSITION 



however, admitted that the law of causality is tran- 

 scendental. 1 



In a later paper, written in 1888, dedicated to 

 Eduard Zeller on the occasion of his jubilee, Helm- 

 holtz endeavoured to disprove that the axioms of 

 arithmetic were also a priori truths. 



1 For a criticism of Helmholtz's papers on the axioms of geometry, 

 the reader is referred to a paper by W. Stanley Jevons in Nature, vol. iv., 

 p. 481, 1871. See also Helmholtz's lecture on The Origin and Significance 

 of Geometrical Axioms. Lectures, 2nd series, p. 27. London, 1881. 



267 



