CONTENTS. 
X. On Platina and native Palladium from Brasil. By William 
Hyde Wollaston, M. D. Sec. R. S. p. 189 
XI. On a native Arseniate of Lead. By the Rev. William 
Gregor. Communicated by Charles Hatchett, Esq. F. R. S. 
P- 195 
XII. An anatomical Account of the Squalus maximus ( of Lin- 
naeus), which in the Structure of its Stomach forms an inter- 
mediate Link in the Gradation of Animals between the Whale 
Tribe and cartilaginous Fishes. By Everard Home, Esq. 
F. R. S. p. 
XIII. On an Improvement in the Manner of dividing astronomical 
Instruments. By Henry Cavendish, Esq. F. R.S . p. 221 
XIV. On a Method of examining the Divisions of astronomical 
Instruments. By the Rev. William Lax, A. M. F. R. S. 
Lowndes's Professor of Astronomy in the University of Cam- 
bridge. In a Letter to the Rev. Dr. Maskelyne, F. R. S. 
Astronomer Royal. p. 232 
XV. On the Identity of Columbium and Tantalum. By Wil- 
liam Hyde Wollaston, M. D. Sec. R. S. p. 24 6 
XVI. Description of a reflective Goniometer. By William Hyde 
Wollaston, M. D. Sec. R.S. p. 253 
XVII. Continuation of Experiments for investigating the Cause of 
coloured concentric Rings , and other Appearances of a similar 
Nature. By William Herschel, LL. D. F. R. S. p. 259 
XVIII. An Account of a Calculus from the Human Bladder of 
uncommon Magnitude . By Sir James Earle, F. R. S. p. 303 
XIX. On expectorated Matter. By George Pearson, M.D. 
F. R. S. 
P- 3*3 
XX. On the Attractions of homogeneous Ellipsoids. By James 
