_Discourses_ contain'd in this _Volume_.
_An Estimate of the Quantity of _Vapours_ raised out of the Sea,
as derived from Experiment: Together with an Account of the
_Circulation_ of the wat'ry Vapours of the Sea, and of the Cause of
_Springs_. Presented to the Royal Society by Mr. _E. Halley_,
F. R. S._ Pag. 1
_The True Theory of the _Tides_, extracted from that admired Treatise
of Mr. _Isaac Newton_, Intituled _Philosophiæ Naturalis Principia
Mathematica_; being a Discourse presented with that Book to the late
King _James_, by Mr. _E. Halley_._ 13
_A Theory of the _Variation_ of the _Magnetical Compass_, by
Mr. _E. Halley_._ 27
_An Account of the Cause of the Change of the _Variation_ of the
_Magnetical Needle_, with an Hypothesis of the Structure of the
_Internal Parts_ of the _Earth_; as it was presented to the Royal
Society in one of their late Meetings, by Mr. _E. Halley_._ 43
_An Historical Account of the _Trade-Winds_ and _Monsoons_, observable
in the Seas between and near the _Tropicks_; with an Attempt to
assign the Physical Cause of the said Winds, by Mr. _E. Halley_._ 61
_A Discourse of the Rule of the Decrease of the Heighth of the
_Mercury_ in the _Barometer_, according as Places are elevated above
the Surface of the _Earth_; with an Attempt to discover the true
Reason of the rising and falling of the _Mercury_, upon Change of
Weather, by Mr. _E. Halley_._ 81
_A Letter from Mr. _Isaac Newton_, while Professor of the Mathematicks
in the University of _Cambridge_; containing his new _Theory_ about
_Light_ and _Colours_: Sent from _Cambridge, Feb. 6. 1671/72._ in
order to be communicated to the Royal Society._ 97
_A farther Explanation of the same _Theory_._ 114
_A Demonstration concerning the _Motion of Light_, communicated from
_Paris_._ 118
_An Introductory Essay to the Doctrine of _Sounds_, containing some
Proposals for the Improvement of _Acousticks_; as it was presented to
the _Dublin_ Society, by the Right Reverend Father in God
_Narcissus_, Lord Bishop of _Ferns_ and _Leighlin_._ 121
_A Discourse concerning the Modern _Theory_ of _Generation_, by Dr.
_Geo. Garden_, of _Aberdeen_, being part of a Letter to Dr. _William
Musgrave_, L. L. D. _Reg. Soc. S._ and by him communicated to the
Royal Society._ 142
_A short Discourse concerning _Concoction_ Read at a Meeting of the
_Royal Society_, by _Clopton Havers_, M. D. Fellow of the Royal
Society._ 153
_A Discourse concerning some Influence of _Respiration_ on
the Motion of the _Heart_ hitherto unobserved. By _J. Drake_, M. D.
F. R. S._ 171
_Some Thoughts and Experiments concerning _Vegetation_. By _John
Woodward_, M. D. of the College of Physicians and Royal Society, and
Professor of Physick in _Gresham-College_._ 203
_An Account of the Measure of _Gold_ upon Gilt Wire; together with a
Demonstration of the exceeding Minuteness of the _Atoms_, or
constituent Parts of _Gold_; as it was read before the _Royal
Society_, by Mr. _E. Halley_._ 243
_An Account of the several Species of _Infinite Quantity_, and of the
Proportions they bear one to the other; as it was read before the
_Royal Society_, by _E. Halley_._ 246
_An Account of Dr. _Robert Hook's_ Invention of the _Marine Barometer_,
with it's Description and Uses. Published by Order of the Royal
Society by Mr. _E. Halley_._ 250
_A Discourse concerning the _Proportional Heat_ of the Sun in all
_Latitudes_; with the Method of collecting the same, as it was read
before the _Royal Society_ in one of their late Meetings, by Mr. _E.
Halley_._ 256
_Concerning the Distance of the _Fixed Stars_, by the Honourable _Fran.
Roberts_, Esq; F. R. S._ 265
_Mr. _Isaac Newton's_ Theory of the _Moon_._ 268
_An estimate of the Degrees of the Mortality of _Mankind_, drawn from
Curious Tables of _Births_ and _Funerals_ at the City of _Breslaw_;
with an Attempt to ascertain the _Price of Annuities_ upon Lives, by
Mr. _E. Halley_._ 280
_A Discourse concerning _Gravity_, and its Properties, wherein the
Descent of _Heavy Bodies_, and the Motion of _Projects_ is briefly,
but fully handled: Together with the Solution of a Problem of great
Use in _Gunnery_, by Mr. _E. Halley_._ 302
_A Proposition of General Use in the Art of _Gunnery_, shewing the Rule
of laying a _Mortar_ to pass, in order to strike any Object above or
below the Horizon, by Mr. _E. Halley_._ 326
_A Discourse concerning the Measure of the Air's Resistance to Bodies
moved in it. By the Learned _John Wallis_, S. T. D. and F. R. S._ 332
_An Instance of the Excellency of the Modern _Algebra_, in the
Resolution of the Problem of finding the _Foci_ of Optick Glasses
universally. By Mr. _E. Halley_, S. R. S._ 348