TRANSACTIONS 



OF THK 



ROYAL SOCIETY 



OF 



EDINBURGH. 



VOL. XXXIII. 



EDINBURGH: 



PUBLISHED BY ROBERT GRANT & SON, 107 PRINCES STREET, 

 AND WILLIAMS & NORGATE, 14 HENRIETTA STREET, COVEN T GARDEN, LONDON. 



MDCCCLXXXVIII. 



