Adjudication of the Medals of the Royal Society for the year 1883, 
by the President and Council. 
The Copley Medal to Professor Sir William Thomson, F.Ii.S., for (1) his 
discovery of the law of the universal dissipation of energy; (2) his researches and 
eminent services in physics, both experimental and mathematical, especially in the 
theory of Electricity and Thermo-clynamics. 
A Royal Medal to Professor T. A. Hirst, F.R.S., for his researches in Pure 
Mathematics. 
A Royal Medal to Professor J. S. Burdon-Sanderson, M.D., F.R.S., for the 
eminent services which he has rendered to physiology and pathology, especially for his 
investigation of the relations of Micro-organisms to disease, and for his researches on 
the electric phenomena of plants. 
The Davy Medal to Marcellin Berthelot, For. Mem. R.S., and Professor Julius 
Thomsen, for their researches in Thermo-chemistry. 
The Bakerian Lecture “ On Radiant Matter Spectroscopy: the Detection and wide 
Distribution of Yttrium/’ was delivered by Mr. W. Crookes, F.R S. 
The Paper “ On the Direct Influence of Gradual Variations of Temperature upon the 
Rate of Beat of the Dog’s Heart,” by Dr. H. Newell Martin, was appointed as the 
Croonian Lecture. 
