TRANSACTIONS 



CAMBRIDGE 



PHILOSOPHICAL SOCIETY. 



Volume VIII. Part IV. 



CAMBRIDGE: 



PRINTED AT THE UNtVBRSlTY PBEHH; 



AND BOLD iiV 



JOHN WILLIAM PARKER, WEST STRAND. LONDON; 



J. & J. J. UEIGHTON; AND MACMILLAN ic CO., CAMBltlDUE. 



M.DCCO.XLVII. 



