EEPOET 



OF THE 



FIFTY-FIEST MEETING 



OF THE 



BRITISH ASSOCIATION 



FOR THE 



ADVMOEMENT OF SCIENCE; 



HELD AT 



YORK IN AUGUST AND SEPTEMBER 1881. 



LONDON : 

 JOHN MUKRAY, ALBEMA-M.E STREET. 



1882. 



■Office of the Association: 22 Ai-BEMAhi treet, London, W. 



