CONTENTS. 
XI. Account of some Experiments on the Descent of the Sap in 
Trees. In a Letter from Thomas Andrew Knight, Esq. to 
the Right Hon. Sir Joseph Banks, Bart. K. B. F. R. S. 
page 277 
XII. Enquiries concerning the Nature of a metallic Substance 
lately sold in London, as a nezv Metal, under the Title of 
Palladium. By Richard Chenevix, Esq. F. R. S. and 
M.R. I. A. p. 290 
XIII. An Account of the sinking of the Dutch Frigate Ambuscade, 
of 32 Guns, near the Great Nore ; zvith the Mode used in 
recovering her. By Mr. Joseph Whidbey, Master Attendant in 
Sheerness Dock Tard. Communicated by the Right Hon. Sir 
Joseph Banks, Bart. K. B. P. R. S. p 321 
XIV. Observations on a new Species of hard Carbonate of Lime ; 
also on a new Species of Oxide of Iron. By the Count de 
Bournon, F. R. S. and L. S. p. 325 
XV. Account of the Changes that have happened, during the last 
Twenty-five Tears, in the relative Situation of Double-stars ; 
with an Investigation of the Cause to which they are ozving. 
By William Herschel, LL. D. F. R. S. p. 339 
