CONTENTS. 
XII. A Description of a Transit Circle, for determining the 
Place of celestial Objects as they pass the Meridian. By the 
Rev. Francis Wollaston, LL. B. and F. R. S. p. 133 
XIII. Description of an extraordinary Production of Human 
Generation, with Observations. By John Clarke, M. D. 
Communicated by Sir Joseph Banks, Bart. P. R. S. p. 154 
XIV. Description of an Instrument for ascertaining the specific 
Gravities of Fluids. By John Godfrey Schmeisser. Commu- 
nicated by Sir Joseph Banks, Bart. P. R. S. p. 1 64 
XV. Extract of a Letter from Sir Charles Blagden, Knt. 
Sec. R. S. to Sir Joseph Banks, Bart. P. R. S. giving some 
Account of the Tides at Naples. p. 168 
XVI. Observations on Vision. By Thomas Young. Communi- 
cated by Richard Brocklesby, M.D. F. R. S. p. 169 
XVII. Observations on a Current that often prevails to the 
Westward of Scilly ; endangering the Safety of Ships that 
approach the British Channel. By James Rennell, Esq. 
F K S. p. 182 
XVIII. Observations on the Planet Venus. By William 
Herschel, LL. D. F. R. S. p. 201 
