Adjudication of the Medals of the Royal Society for the year 1864 by 
the President and Council. 
The Copley Medal to Charles Darwin, Esq., F.R.S., for his important Researches 
in Geology, Zoology, and Botanical Physiology. 
The Rumford Medal to Professor John Tyndall, F.R.S., for his Researches on the 
Absorption and Radiation of Heat by Gases and Vapours. 
A Royal Medal to Jacob Locehart Claree, Esq., F.R.S., for his Researches on the 
Intimate Structure of the Spinal Cord and Brain, and on the Development of the Spinal 
Cord, published in live Memoirs in the Philosophical Transactions and in other writings. 
A Royal Medal to Warren De la Rue, Esq., F.R.S., for his Observations on the 
Total Eclipse of the Sun of 1860, and for his improvements in Astronomical Photo- 
graphy. 
Professor J. Tyndall’s Paper, entitled “ Researches on Radiant Heat, — Fifth Me- 
moir,” was appointed as the Baeerian Lecture. 
The Croonian Lecture was delivered by Professor Hermann Helmholtz, For. Mem. 
R.S. : it was entitled “ On the Normal Motions of the Human Eye in relation to Bino- 
cular Vision.” 
