HISTORY of the SOCIETY. 19 
Phyf. Cl. The fequel of Dr Biatr’s paper was read, viz. 
Experiments and Obfervations on the Unequal Refrangibility of 
Light. The paper is publifhed in this volume. [No. I. Phy/. 
Ci.) 
Lit. Cl. The remainder of Dr Doic’s Differtation on the 
ancient Hellenes was read. 
A GENERAL Meeting of the Royal Society was held for the 
election of Members. [See Appendix to the Hiftory of the 
Society. ] 
Phyf. Ci. There was read an Analyfis of the Waters of the 
Hot Springs of Geyzer and Rykum in Iceland, by Dr Brack, 
Profeflor of Chemiftry in the Univerfity of Edinburgh. The 
paper is publifhed in this volume. [No. IV. Phyf Cl.] 
Lit. Cl. Mr Dauzex read an Account of a Journey made 
from Rome to Tivoli, by ANDREW LumispDEN, E{q; with a De- 
{cription of a Marriage-ceremony, taken from a bas-relief on 
a farcophagus at Tivoli, being a letter from the Author, addrefled 
to Joan Maccowan, Efq; Edinburgh. This paper, as being 
intended by Mr LumispeEN for a part of a larger work, was not 
put into the hands of the Committee for publication. 
Phyf. Cl. Dr Hutton communicated fome additional Ob- 
fervations on Granite. Thefe make part of the paper referred 
to above. [No. II. of this volume, Phyf C7. ] 
Phyf. Cl. A Letter was read from Joun Tuomas STAN- 
LEY, Efq; M.P. to Dr Brack, giving an Account of the Hot 
Springs of Rykum in Iceland. This letter is publifhed in this 
volume. [No. V. Phy/. Ci.] 
| (C 2) Some 
1791. 
April 4. 
Dr Blair on the 
unequal refran- 
~ gibility of light, 
April 18. 
Dr Doig on the 
ancient Hel- 
lenes. 
June 27. 
General Meet 
ing. 
July 4. 
Dr Black’s ana- 
lyfis of the wa- 
ters of Geyzer 
and Rykum. 
July 18. 
Mr Lumifden’s 
journey to Ti- 
voli, 
Aug. 1. 
Dr Hutton on 
granite, 
Nov. 7. 
Mr Stanley’s 
account of the 
hot fprings of 
Rykum, 
