XX. A formula for expressing the decrement of human life. 
In a letter addressed to Sir Edward Hyde East, Bart. M. P. 
F. R. S. By Thomas Young, M. D. For. Sec. R. S. Com- 
municated February 2, 1826. - - 281 
XXL Account of an experiment on the elasticity of ice. By 
Benjamin Bevan, Esq. In a Letter to Dr. Thomas Young, 
For. Sec. R. S. - - - - 304 
XXII. Results of the application of Captain Rater's floating 
collimator to the astronomical circle at the observatory of Trinity 
College , Dublin , and remarks relative to those results. By the 
Rev. J. Brinkley, D.D. F. R. S P. R. I. A. Communicated 
by the Board of Longitude February 2, 1826. - 307 
XXIII. On the means of facilitating the observation of distant 
stations in geodcetical operations. By Lieutenant Thomas 
Drummond, of the Royal Engineers. Communicated April 14, 
1826, by Lieut. Col. H. Colby, F. R. S. - 324 
XXIV. On the production and formation of pearls. By Sir 
Everard Home, Bart. V . P. R. S. - - 338 
XXV. On burrowing and boring marine animals. By Edward 
Osler, Esq. Communicated February 15, 1826, by L. W. 
Dyllwin, Esq. F.R. S. - - - 342 
XXVI. An account of some experiments relative to the passage 
of radiant heat through glass screens. By the Rev. Baden 
Powell, M. A. F. R. S. of Oriel College , Oxford. Commu- 
nicated March 9, 1826. - 372 
XXVII The Bakerian Lecture. On the relations of electrical 
and chemical changes. By Sir Humphry Davy, Bart. 
Pres. R. S. - - - - - 383 
