The President and Council of the Royal Society adjudged the 
Copley Medal for the year 1831 — 
To George Biddell Airy, Esq. M.A. Plumian Professor of Astronomy and 
Experimental Philosophy in the University of Cambridge, for his papers f On 
the Principle of the Construction of the Achromatic Eye-pieces of Telescopes,’ 
— c On the Spherical Aberration of the Eye-pieces of Telescopes,’ — and for 
other papers on Optical Subjects in the Transactions of the Cambridge Philo- 
sophical Society. 
