DEPARTMENT OF APPLIED MATHP 



UNIVERSITY COLLEGE, UNIVERSITY OF LONDC&k 



DRAPERS' COMPANY RESEARCH 



MEMOIRS 



BIOMETRIC SERIES. 



III. MATHEMATICAL CONTRIBUTIONS TO THE THEORY 



OF EVOLUTION.— XV. A MATHEMATICAL 



THEORY OF RANDOM MIGRATION. 



BY 

 KARL PEARSON, F.R.S. 



WITH THE ASSISTANCE OF 



JOHN BLAKEMAN, M.Sc. 



LONDON : 



PUBLISHED BY DULAU AND CO., 37, SOHO SQUARE, W. 



1906 



