Adjudication of the Medals of the Royal Society for the year 1875 by 
the President and Council. 
The Copley Medal to Professor August Wilhelm Hofmann, F.R.S., for his 
numerous contributions to the science of Chemistry, and especially for his Researches 
on the Derivatives of Ammonia. 
A Royal Medal to Mr. William Crookes, F.R.S., for his various chemical and 
physical researches, more especially for his discovery of Thallium, his investigation of 
its compounds, and determination of its atomic weight ; and for his discovery of the 
repulsion referable to radiation. 
A Royal Medal to Dr. Thomas Oldham, F.R.S., for his long and important services 
in the Science of Geology, first as Professor of Geology, Trinity College, Dublin, and 
Director of the Geological Survey of Ireland, and chiefly for the great work which he 
has long conducted as Superintendent of the Geological Survey of India, in which so 
much progress has been made that, in a few years, it will be possible to produce a 
Geological Map of India comparable to the Geological Map of England executed by 
the late Mr. Greenough ; also for the series of volumes of Geological Reports and 
Memoirs, including the ‘ Palseontologica Indica,’ published under his direction. 
The Bakerian Lecture was delivered by Professor W. G. Adams, F.R.S. : it was 
entitled “ On the Forms of Equipotential Curves and Surfaces and Lines of Electric 
Force.” 
The Croonian Lecture was delivered by Professor David Ferrier, M.D. : it was 
entitled “ Experiments on the Brain of Monkeys (Second Series).” 
