TRANSACTIONS 



OF THE 



ROYAL SOCIETY 



OF 



EDINBURGH. 



VOL. XXXII. 



EDINBURGH: 



PUBLISHED BY ROBERT GRANT. & SON, 107 PRINCES STREET, 

 AND WILLIAMS & NORGATE, 14 HENRIETTA STREET, COVENT GARDEN, LONDON. 



MDCCCLXXXVII. 



