278 INTRODUCTION TO PHILOSOPHY OF SCIENCE 



and times; and even irrationals are subject to empirical 

 reference in the ascertainment of the length of the diagonal 

 of a square. The techniques of measurement serve to 

 establish these empirical connections. 



REFERENCES 



Bertrand Russell, Principles of Mathematics (Cambridge: Cam- 

 bridge University, 1903). 



Introduction to Mathematical Philosophy (London: Allen 



and Unwin, 1920). 



T. Dantzig, Number, the Language of Science (London: Allen and 

 Unwin, 1930). 



J. W. Young, Fundamental Concepts of Algebra and Geometry (New 

 York: Macmillan, 1927). 



A. N. Whitehead, Science and the Modern World (New York: Mac- 

 millan, 1925), Chap. II. 



E. V. Huntington, The Continuum (Cambridge: Harvard Uni- 

 versity, 1917). 



E. W. Hobson, Domain of Natural Science (New York: Macmillan, 

 1923), Chap. V. 



