INDEX. 305 



Extracts from two Letters from Dr. Wall of Oxford, to Dr. Percival, in 

 reply to the foregoing Queries concerning Attraction and Repulsion ; comrou> 

 nicated to the Literary and Philosophical Society. IL 455. 



Facts and Queries relative to Attraction and Repulsion. By Thomas Per- 

 cival, M.D., &c. II. 445. 



Some Observations on the Phoenomena, which take place between Oil and 

 Water, in a Letter to Thomas Percival, M.D., F. R. S. and S. A., &c. By Martin 

 Wall, M.D., Praelector of Chemistry in the University of Oxford. II. 435. 



A Description of a New Instrument for Measuring the Specific Gravity of 

 Bodies. By Mr. William Nicholson, in a Letter to Mr. J. H. Magellan, F.R.S., 

 Reg. Acad. Petropol. and Paris. Corresp., &c. II. 386. 



On the Pursuit of Experimental Philosophy. By Thomas Percival, M.D., 

 F.R.S. and S.A., &c. IL 842. 



Description of a Glory. By John Haygarth, M.B., F.R.S. Loud., F.R.S. 

 and R.M.S. Kdinb., and Fellow of the American Academy of Arts and Sciences. 

 Communicated by Dr. Percival. III. 4(13. 



Observations on the Knowledge of the Ancients respecting Electricity. By 

 William Falconer, M.D., F.R.S. Communicated by Dr. Percival. III. 278. 



Remarks on the Floating of Cork Balls in Water. By Mr. Banks, Lecturer 

 in Natural Philosophy. Communicated by the Rev. Thomas Barnes, D.D., 

 Fellow of the American Philosophical Society holden at Philadelphia. III. 178. 

 Conjectures relative to the Cause of the Increase of Weight acquired by 

 some heated Bodies during cooling. By Thomas Henry, junior. Coramuni- 

 cated by Thomas Henry, F.R.S., &c. III. 174. 



Letter on Attraction and Repulsion. Communicated by Dr. Percival. 

 in. 116. 



Reasons for supposing that Lakes have been more numerous than they are 

 at present; with an Attempt to Assign the Causes whereby they have been 

 defaced. By J. Gough of Kendal. Communicated by Dr. Percival. IV. 

 (Part 1) 1. 



Remarks on Dr. Priestley's Experiments and Observations relating to the 

 Analysis of Atmospherical Air, and his Considerations on the Doctrine of Phlo- 

 giston and the Decomposition of Water. By Theopbilus Lewis Rupp. W 

 (Part 2) 128. 



On the Theory of Compound Sounds. By Mr. John Gough. Communi- 

 cated by Dr. Holme. V. (Part 2) 653. 



An Investigation of the Method whereby Men judge, by the Ear, of the 

 Position of Sonorous Bodies relative to their own Persons. By Mr. John 

 Gough. Communicated by Dr. Holme. V. (Part 2) 622. 



Experiments on the Velocity of Air issuing out of a Vessel in different cir- 

 cumstances ; with the Description of an Instrument to Measure the Force of 

 the Blast in Bellows, &c. By Mr. Banks, Lecturer in Natural Philosophy. 

 Communicated by Mr. Dalton. V. (Part 2) 808. 



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