Adjudication of the Medals of the Royal Society for the year 1843 by 
the President and Council. 
The Copley Medal to M. Jean Baptiste Dumas, for his late valuable researches 
in Organic Chemistry, particularly those contained in a series of memoirs on Chemical 
Types and the Doctrine of Substitution, and also for his elaborate investigations of 
the Atomic Weights of Carbon, Oxygen, Hydrogen, Nitrogen, and other elements. 
The Royal Medal, in the department of Physics, to Professor James David 
Forbes, F.R.S., for his Paper entitled “ On the Transparency of the Atmosphere, 
and the Law of Extinction of the Solar Rays in passing through it,” published in 
the Philosophical Transactions for 1842. 
The other Royal Medal, not having been awarded in the department of Mine- 
ralogy and Geology, was awarded in that of Physics to Professor Charles Wheat- 
stone, F.R.S., for his Paper entitled, “An Account of several new Instruments and 
Processes for determining the Constants of a Voltaic Circuit,” published in the 
Philosophical Transactions for 1843. 
