C Vi 3 
IX. An Account of a Method of measuring the comparative Inten- 
sities of the Light emitted by luminous Bodies. By Lieutenant- 
General Sir Benjamin Thompson, Count of Rumford, F. R. S. 
In two Letters to Sir Joseph Banks, Bart. P. R. S. p. 6 7 
X. An Account of some Experiments upon coloured Shadows. 
By Lieutenant-General Sir Benjamin Thompson, Count of 
Rumford, F. R. S . In a Letter to Sir Joseph Banks, Bart. 
P. R. S. p. 107 
XI. Investigations, founded on the Theory of Motion, for deter- 
mining the Times of Vibration of Watch Balances. By George 
Atwood, Esq. F. R. S. p. 119 
APPENDIX. 
Meteorological Journal kept at the Apartments of the Royal So- 
ciety, by Order of the President and Council „ 
ERRATA. 
Page 14, line 17, for XY, read XI. 
Page 151, line 4, for remaining semiarc, read remaining part of the semiarc. 
Page 153, note, line 6 from the bottom, for 91, read 87. 
Ibid. note, line 4 from the bottom,/or 5, read 9. 
Page 167, line 14, for so adjusted, read adjusted sq. 
