CONTENTS, 
I. The Bakerian Lecture. — On a method of rendering Platina malleable. 
By William Hyde Wollaston, M.D. F.R.S page 1 
II. A description of a Microscopic Doublet. By William Hyde Wollaston, 
M.D. F.R.S. 9 
III. An account of some experiments on the Torpedo. By Sir Humphry Davy, 
Bart. F.R.S 15 
IV. On a method of comparing the light of the sun with that of the fixed stars. 
By William Hyde Wollaston, M.D. F.R.S 19 
V. On the water of the Mediterranean. By William Hyde Wollaston, M.D. 
F.R.S. 29 
VI. An account of the preliminary experiments and ultimate construction of a re- 
fracting telescope of 7-8 inches aperture, with a fluid concave lens. In a 
letter addressed to Davies Gilbert, Esq. President of the Royal Society. 
By Peter Barlow, Esq. F.R.S. 33 
VII. On the dip of the magnetic needle in London, in August 1828. By Captain 
Edward Sabine of the Royal Artillery, Secretary of the Royal Society 4 7 
VIII. Remarhs on the tendency to Calculous Diseases ; with observations on the 
nature of urinary concretions, and an analysis of a large part of the col- 
lection belonging to the Norfolk and Norwich Hospital. By John Yel- 
loly, M.D. F.R.S 55 
IX. Experiments to determine the difference in the number of vibrations made by 
an Invariable Pendulum in the Royal Observatory at Greenwich, and in 
the house in London in which Captain Rater’s experiments were made. 
By Captain Edward Sabine of the Royal Artillery, Secretary of the 
Royal Society. Communicated by the President and Council ... 83 
