SOM: 4) 
THE 
SCIENTIFIC PROCEEDINGS 
OF THE 
ROYAL DUBLIN SOCIETY. 
Vol. XI.(N.8.), No. 12. OCTOBER, 1906. 
ON ENTOPTIC VISION, 
[PART IV.] 
BY 
PROFESSOR W. F. BARRETT, F.R.S., 
PROF, OF EXPERIMENTAL PHYSICS, ROYAL COLLEGE OF SCIENCE OF IRELAND. 
(PLATES VI.-VIII.) 
[Authors alone are responsible for all opinions expressed in their Communications. | 
DU ELAN = 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 
LEINSTER HOUSE. 
WILLIAMS AND NOKGATE, 
14, HENRIETTA-STREET, COVENT GARDEN, LONDON, W.C. 
1906. 
Price One Shillin 
e 
‘DEC14 1906 
National musevS 
