TRANSACTIONS 



CAMBRIDGE 



PHILOSOPHICAL SOCIETY. 



Volume IX. Part II. 



CAMBRIDGE: 



PRINTED AT TBB UNIVERSITY PRESS; 



vvn BOLD BY 



JOHN W. PARKER AND SON, WEST STRAND, LONDON; 

 J. DEIGHTON; AND MACMILLAN & CO., CAMBRIDGE. 



M.DCCC.LI. 



