TRANSACTIONS 



OF THB 



EOYAL SOCIETY 



OF 



EDINBURGH. 



VOL. XXXV. 



EDINBURGH: 



PUBLISHED BY ROBERT GRANT & SON, 107 PRINCES STREET, 

 AND WILLIAMS & NORGATE, 14 HENRIETTA STREET, CO VENT GARDEN, LONDON. 



MDCCCXC. 



