TRANSACTIONS 



OF THE 



ROYAL SOCIETY 



OF 



EDINBURGH. 



VOL. L. 

 Nl8T0g! 



EDINBURGH : 



PUBLISHED BY ROBERT GRANT & SON, 107 PRINCES STREET, 

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



MDCCCCXVI. 



