Copy letter from John Rose Bradford to the Corresponding Secretary, the Academy of Natural Science of Philadelphia, USA 'The invitation of the Philadelphia Academy of Natural Science for the Royal Society to be represented at the forthcoming Centenary Celebrations has been considered by the PResident and Council, and I have the pleasure to inform you that they have appointed Prof. Ernest William Brown Ma, Sc.D, FRS, their delegate. Professor Brown's address is, Yale University, New Haven, Connecticut.' 26 February 1912