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‘[Novemer, 1899.] 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
mow DUBIN SOCIETY. 
VOLUME VII.—(SERIES II.) 
III. 
AN ESTIMATE OF THE GHOLOGICAL AGH OF THE BARTH. 
By J. JOLY, M.A., D.Sc., F.R.S., 
Honorary Secretary of the Royal Dublin Society ; 
Professoor of Geology and Mineralogy in the University of Dublin. 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 
WILLIAMS AND NORGATE, 
14, HENRIETTA STREET, COVENT GARDEN, LONDON, 
20, SOUTH FREDERICK STREET, EDINBURGH; anv 7, BROAD STREET, OXFORD. 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND WELDRICK. 
1899. 
Price One Shilling and Sixpence. 
