Adjudication of the Medals of the Royal Society for the year 1871 by 
the President and Council. 
The Copley Medal to Dr. Julius Robert yon Mayer, of Heilbronn, for his Researches 
on the Mechanics of Heat; including Essays on: — 1. The Forces of Inorganic Nature. 
2. Organic Motion in connexion with Nutrition. 3. Fever. 4. Celestial Dynamics. 
5. The Mechanical Equivalent of Heat. 
A Royal Medal to Dr. John Stenhouse, F.R.S., for his Researches on the Lichens 
and their proximate constituents and derivatives, including Erythrite ; and for his 
Researches on the action of Charcoal in purifying Air. 
A Royal Medal to Mr. George Busk, F.R.S., President of the Royal College of 
Surgeons, for his Researches in Zoology, Physiology, and Comparative Anatomy. 
The Bakerian Lecture was delivered by Charles William Siemens, F.R.S., D.C.L. ; 
it was entitled “ On the Increase of Electrical Resistance in Conductors with rise of 
Temperature, and its application to the Measure of Ordinary and Furnace Tempe- 
ratures; also on a simple Method of Measuring Electrical Resistances.” 
The Croonian Lecture was not delivered. 
