_ [Ocropzr, 1901.) 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
ROVE DUSbLIN SOCTHIY 
VOLUME VII—(SERIES II.) 
XIII. 
VARIATION: GERMINAL AND ENVIRONMENTAL. 
BY 
J. C. EWART, M.D., F.BS., 
Regius Professor of Natural History in the University of Edinburgh. 
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. 
1901. 
Price One Shilling. 
