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HE Right Honourable the Earl of Pem broke.

Mr. Samuel Pachel M. A.

Rev. Mr. Parne. Fellow of Trinity College and Librarian of the Univerfity of Cambridge Books.

4

Rev. Caleb Parnham S. T. B. Fellow of Saint
John's College Cambridge.

Rev. Mr. Pate of Cajus College Cambridge.
Mr. Pattifon of Stockton.

Mr. Simon Patrick Fellow of Cath. Hall Camb.
Rev. Mr. Peleffier Fell. of Trin. Coll. Dublin.
Henry Pemberton M. D. 3 Books.

Mr. Henry Pennant of Queen's College Camb.
Mr. John Pilkington of Ireland.
Mr. Pine.

Mr. Joshua Platts of Leicester.

Mr Charles Plucknet of Sidney College Camb. And. Plummer M. D. Prof. of Med. at Edinb. Henry Plumtree M. D.

Mr. Charles Plumtree Fell. of Qu. Coll. Cambr. Mr. William Potter of Gainsbrough.

John Pringle M. D.

Rev. Mr. Prior late Fell. of Tria. Coll. Camb. John Pulland Efq;

Samuel Pye M. D.

Q.

Queens College Library Cambridge.

Riccards.

R.

Rev. Mr. Morgan Fell. of Trin. Coll. 6 Books. MR. Robarts Efq; 6 Books.

Mr. Morgan late Anatomy Profeffor at Camb.
Mr. Gale Morris.

Mr. Corbyn Morris.

Rev. Mr. Mofs Fellow of Cajus Coll. Camb. Mr. Alex. Munroo Prof. Anat. at Edinburgh. Rev. Mr. William Murdin S. T. B.

Rev. Mr. Murgatroyd.

N.

IS Grace the Duke of Norfolk.

H Mr. Nailer.

Dr. Nettleton of Halifax.

Rev Mr. Peter Newcome of Queens Coll. Camb.

Roger North Efq;

Honourable Mr. North.

Bryan Robinson M D. Matthew Robinfon Efq;

Rev. Jonathan Rogers D. D. Senior Fellow of Trinity College Dublin.

Rev. George Henry Rook M. A. Fellow of Chrift College Cambridge.

Patrick Rofs of Innernethy Efq;

Charles Roffe Eiq;

*William Roffe Elq;

Rev. John Rowning M.A.

William Rutty M. D. late Sec. to the R. Society. John Ruffel Efq;

Dudley Ryder Efq; his Majefty's Attorney Gen.

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Thomas Whichcot Efq; of Harpfwell..
Taylor White Efq;

Rev. Mr. Whitehall Fellow of Trinity College
Cambridge.

Mr. John Whitfield Surgeon at Salop.
Dr. Wilbraham.

Rev. Dr. Wilcox Mafter of Clare-Hall Camb.. *Mr. Francis Wilks.

Rev. Mr. Williams Rector of Ockham.
Rev. Dr. Williams Prefident of Saint John's
College Cambridge and publick Orator.
Dr. Wilmot.

Rev. Mr. Benjamin Wilson Prebendary of York
Rev. Mr. John Wilson Fellow of Trinity Coll
Cambridge.

*Clifton Wintringham M. D.

Clifton Wintringham Jun. M. D. *Rev. Mr Witton.

Francis Wollafton Efq;

Thomas Woodford Elq;
Daniil Wrag Efq:

George Wright Elq;

Mr. Robert Wright of Winnick.

Rev. Mr. Henry Wrigley Fellow of Saint Johns Cambridge.

Peter Wyche Efq; .

A TABLE

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CHAP. 6.

Concerning the Origine and Caufe of Colours.

70%

CHAP. 7.

Concerning the caufe of Refraction, Reflection, Inflection and
Emiffion of Light.

86

CHAP. 8.

Concerning Transparency, Opacity and Colours in Bodies. 95

CHAP. I.
CHAP. 2.
CHAP. 3.
CHAP. 4.

CHAP. 5.

BOOK II.

A Mathematical Treatife.

To find the Focus of Rays reflected from any given Surface. 100 To determine the place, magnitude and fituation of Images formed by reflected Rays.

103.

104.

To find the Focus of Rays falling almoft perpendicularly upon
any refracting Surface, Sphere or Lens.
To determine the place, magnitude and fituation of Images
formed by refracted Rays.

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To determine the apparent Distance, Magnitude, Situation, degree of Diftinctness and Brightness, the greatest Angle of Vifion and Vifible Area of an Object, feen by rays fucceffively. reflected from any number of plane or spherical Surfaces; or fucceffively refracted through any number of Lens's of any. fort; or through any number of different Mediums, whofe Jurfaces are plane or spherical: with an Application to TeleJcopes and Microscopes.

III.

CHAP. 6.

CHAP. 6. To determine the Aberrations of rays from the geometrical fo-
cus, caufed by their unequal refrangibility, and by the fphe-
ricalness of the figure of reflecting and refracting furfaces.

134

A Mechanical Treatife.

CHAP. I. Methods of grinding and polishing Glaffes for Telescopes;
extracted from Mr. Huygens and other Authors, by the Ho-
nourable Samuel Molyneux Efquire.

281

CHAP. 2. Methods of cafting, grinding and polishing Metals for re-
flecting Telescopes; begun by the Honourable Samuel Moly-
neux Efquire, and continued by John Hadley Efquire,
Vice-President of the Royal Society.

CHAP. 3. How to center an Object-glass.

301

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