DEPARTMEXT OF GENERAL PHYSICS. 509 



cones only being present ; and it would therefore seem as if a close connection 

 existed between this peculiar retinal structure and the detection of polarised 

 light and the plane of polarisation by the unaided eye. 



9. Report of the Committee on Electrical Standards. 

 See Reports, p. 104. 



10. J oint Discussion tvith Section E on the Proposed Remcasvrement of the 

 British Geodetic Arcs. — See p. 626. 



