Adjudication of the Medals of the Royal Society for the year 1869 by 
the President and Council. 
The Copley Medal to M. Henri Victor Regnault, For. Mem. R.S., for the second 
volume of his “Relation des experiences pour determiner les lois et les donnees phy- 
siques necessaires au Calcul des Machines a feu including his elaborate investigations 
on the Specific Heat of Gases and Vapours, and various papers on the Elastic Force of 
Vapours. 
A Royal Medal to Sir Thomas Maclear, F.R.S., for his Measurement of an Arc of 
the Meridian at the Cape of Good Hope. 
A Royal Medal to Dr. Augustus Matthiessen, F.R.S., for his researches on the 
electrical and other physical properties of Metals and their Alloys. 
The Bakerian Lecture was delivered by Dr. Thomas Andrews, F.R.S. ; it was 
entitled “ The Continuity of the Gaseous and Liquid States of Matter.” 
The Croonian Lecture was not delivered. 
