CONTENTS. 
I. The Bakerian Lecture. Experiments upon the Resistance of 
Bodies moving in Fluids. By the Rev. Samuel Vince, A. M. 
F. R. S. Plumian Professor of Astronomy and Experimental 
Philosophy in the University of Cambridge. page 1 
II. Experiments and Observations , tending to shozv the Compo- 
sition and Properties of Urinary Concretions. By George 
Pearson, M. D. F. R. S. p. 15 
III. On the Discovery of four additional Satellites of the 
Georgium Sidus. The retrograde Motion of its old Satel- 
lites announced ; and the Cause of their Disappearance at 
certain Distances from the Planet explained. By William 
Herschel, LL.D. F. R. S. p. 47 
IV. An Inquiry concerning the Source of the Heat which is 
excited by Friction. By Benjamin Count of Rumford, 
F. R. S. M. R. I. A. p. 80 
V. Observations on the Foramina Thebesii of the Heart. By 
Mr. John Abernethy, F. R. S. Communicated by Everard 
Home, Esq. F. R. S. p. 103 
VI. An Analysis of the earthy Substance fro?n New South Wales , 
called Sydneia or Terra Australis. By Charles Hatchett, Esq. 
F. R. S. p. 1 10 
