PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
VOL. XI. 
1881-82. 
1ST o. 112. 
Monday, 19 tli June 1882. 
The Right Hon. LORD MONCREIFF, President, 
in the Chair. 
The Council having awarded the Keith Prize, for the Biennial 
Period 1879-81, to Professor Chrystal, for his paper “On the 
Differential Telephone,” published in the Society’s Transactions for 
the Session 1879-80, the Chairman presented the prize. 
Professor Tait, in explaining the grounds of award, said that 
Professor Chrystal’s paper was one of very high scientific interest 
and value, and contained much that was wholly original. But, 
what would be more readily understood by the majority of the 
Society, it was one which contained the description and theory of 
a new instrument destined undoubtedly to improve in a marked 
manner the measurement of electric capacities. Our means of 
measuring these have been, by this paper, raised from mere “rule 
of thumb” to real experimental accuracy. And the subject for 
measurement is one whose scientific and whose practical importance 
are every day becoming greater. 
The Council having awarded the Neill Prize for the Triennial 
Period 1877-80, to Mr. John Murray, for his paper “ On the Struc- 
ture and Origin of Coral Reefs and Islands,” communicated to the 
Society on April 5, 1880, and printed (in Abstract) in the Pro- 
ceedings for that date, the Chairman presented the prize. 
Mr. Buchan, in explaining the grounds of the award, said — 
The Council has awarded to Mr. John Murray the Neill Prize for 
4 Q 
VOL. XI. 
