Letters on Different Subjects in Natural Philosophy, Volume 1 (Letters to a Ger…


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The Letters of Euler to a German Princess have acquired over all Europe a celebrity to which the reputation of the Author, the choice and importance of the several subjects, and the clearness of elucidation justly entitle them. They have deservedly been considered as a treasury of science, adapted to the purposes of every common seminary of learning. They may be studied to advantage without much previous elementary knowledge; they convey accurate ideas respecting a variety of objects, highly interesting in themselves, or calculated to excite a laudable curiosity; they inspire a proper taste for the sciences, and for that sound philosophy which, supported by science, and never losing sight of her cautious, steady, methodical advances, runs no risk of perplexing or misleading the attentive student. - Summary by Nicolas de Condorcet (14 hr 8 min)

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Of Magnitude, or Extension 7:47 Gelesen von Elijah Fisher
Of Velocity 7:07 Gelesen von Elijah Fisher
Of Sound, and Its Velocity 7:52 Gelesen von Elijah Fisher
Of Consonance and Dissonance 6:28 Gelesen von Elijah Fisher
Of Unison and Octaves 8:10 Gelesen von Elijah Fisher
Of Other Consonances 9:14 Gelesen von Cbteddy
Of the Twelve Tones of the Harpsichord 13:19 Gelesen von Cbteddy
Of the Pleasure Derived from Fine Music 5:55 Gelesen von Cbteddy
Compression of the Air 7:23 Gelesen von prajak
Rarefaction and Elasticity of the Air 8:16 Gelesen von prajak
Gravity of the Air 7:01 Gelesen von prajak
Of the Atmosphere, and the Barometer 6:18 Gelesen von Elijah Fisher
Of Air-Guns, and the Compression of Air in Gunpowder 6:43 Gelesen von Elijah Fisher
The Effect Produced by Heat and Cold on All Bodies, and Of, the Pyrometer and T… 5:31 Gelesen von Elijah Fisher
Changes Produced in the Atmosphere by Heat and Cold 7:48 Gelesen von Elijah Fisher
The Cold Felt on High Mountains and at Great Depths Accounted For 7:25 Gelesen von Elijah Fisher
Of Light, and the Systems of Descartes and Newton 6:54 Gelesen von Bonnie de Lyons
Difficulties Attending the System of Emanation 6:36 Gelesen von Bonnie de Lyons
A Different System Respecting the Nature of Rays and of Light Proposed 7:31 Gelesen von Bonnie de Lyons
Of the Propagation of Light 6:42 Gelesen von Bonnie de Lyons
Digression on the Distances of the Heavenly Bodies, and on the Nature of the Su… 6:15 Gelesen von czandra
Elucidations on the Nature of Luminous Bodies, and Their Difference from Opaque… 7:16 Gelesen von Verla Viera
How Opaque Bodies Become Visible Newton's System of the Reflection of Rays Prop… 8:34 Gelesen von Jayjaysil
Examination and Refutation of Newton's System 11:36 Gelesen von Emanuela
A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become… 7:44 Gelesen von Emanuela
Continuation of the Same Subject 8:50 Gelesen von Emanuela
Conclusion: Clearness and Colour of Opaque Bodies Illuminated 9:37 Gelesen von Emanuela
Nature of Colours in Particular 6:28 Gelesen von czandra
Transparency of Bodies Relative to the Transmission of Rays 8:32 Gelesen von Elijah Fisher
Of the Transmission of Rays of Light Through Transparent Mediums, and Their Ref… 8:04 Gelesen von Elijah Fisher
Refraction of Rays of Different Colours 7:14 Gelesen von Elijah Fisher
Of the Azure Colour of the Heavens 8:54 Gelesen von czandra
Of Rays Issuing from a Distant Luminous Point, and of the Visual Angle 6:34 Gelesen von Elijah Fisher
Of the Assistance Which Judgment Lends to Vision 6:43 Gelesen von Elijah Fisher
Explanation of Certain Phenomena Relative to Optics 7:29 Gelesen von Elijah Fisher
Of Shadow 7:16 Gelesen von Elijah Fisher
Of Catoptrics, and the Reflection of Rays from Plain Mirrors 8:24 Gelesen von Elijah Fisher
Reflection of Rays from Convex and Concave Mirrors Burning Mirrors 8:04 Gelesen von Elijah Fisher
Of Dioptrics 8:36 Gelesen von Elijah Fisher
Continuation of Burning — Glasses, and Their Focus 7:12 Gelesen von Elijah Fisher
Of Vision, and the Structure of the Eye 5:24 Gelesen von Elijah Fisher
Continuation Wonders Discoverable in the Structure of the Eye 6:07 Gelesen von Elijah Fisher
Further Continuation Astonishing Difference Between the Eye of an Animal and th… 6:44 Gelesen von Elijah Fisher
Perfections Discoverable in the Structure of the Eye 4:40 Gelesen von Elijah Fisher
Of Gravity, Considered as a General Property of Body 6:58 Gelesen von Elijah Fisher
Continuation of Specific Gravity 6:55 Gelesen von Elijah Fisher
Terms Relative to Gravity and Their True Import 6:29 Gelesen von Elijah Fisher
Reply to Certain Objections to the Erath's Spherical Figure, Derived from Gravi… 6:17 Gelesen von Jayjaysil
True Direction and Action of Gravity Relatively to the Earth 6:52 Gelesen von Verla Viera
Different Action of Gravity with Respect to Certain Countries and Distances fro… 7:57 Gelesen von Verla Viera
Gravity of the Moon 5:33 Gelesen von Verla Viera
Discovery of Universal Gravitation by Newton 9:08 Gelesen von SirRoni
Continuation of the Mutual Attraction of the Heavenly Bodies 9:18 Gelesen von prajak
Different Sentiments of Philosophers Respecting Universal Gravitation the Attra… 7:04 Gelesen von prajak
Power by Which the Heavenly Bodies an Mutually Attracted 4:08 Gelesen von prajak
The Same Subject Continued 6:41 Gelesen von prajak
The Same Subject Continued 6:37 Gelesen von prajak
Motion of the Heavenly Bodies Method of Determining It by the Laws of Universal… 4:56 Gelesen von Cbteddy
System of the Universe 6:40 Gelesen von Cbteddy
The Same Subject Continued 5:29 Gelesen von Cbteddy
Small Irregularities in the Motions of the Planets, Caused by Their Mutual Attr… 5:59 Gelesen von Cbteddy
Description of the Flux and Reflux of the Sea 6:45 Gelesen von Belinda Mc
Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea 6:22 Gelesen von Belinda Mc
Explanation of the Flux and Reflux, from the Attractive Power of the Moon 5:33 Gelesen von Verla Viera
The Same Subject Continued 5:06 Gelesen von Verla Viera
The Same Subject Continued 6:17 Gelesen von Verla Viera
The Same Subject Continued 6:15 Gelesen von Verla Viera
More Particular Account of the Dispute Respecting Universal Gravitation 7:05 Gelesen von Ty Lasky
Nature and Essence of Bodies or Extension, Mobility, and Impenetrability of Body 7:33 Gelesen von ShrimpPhish
Impenetrability of Bodies 5:40 Gelesen von ShrimpPhish
Of the Motion of Bodies, Real and Apparent 8:16 Gelesen von ShrimpPhish
Of Uniform, Accelerated, and Retarded Motion 12:33 Gelesen von SirRoni
Principal Law of Motion and Rest Disputes of Philosophers on the Subject 8:02 Gelesen von jenno
Of the Inertia of Bodies of Powers 7:47 Gelesen von jenno
Changes Which May Take Place in the State of Bodies 8:05 Gelesen von elizabethhousworth
System of the Monads of Wolff 8:09 Gelesen von elizabethhousworth
Origin and Nature of Powers 7:11 Gelesen von Cajucom
The Same Subject Principle of the Least Possible Action 7:16 Gelesen von jenno
On the Question, are There Any Other Species of Powers? 7:40 Gelesen von jenno
Of the Nature of Spirits 5:12 Gelesen von Owlivia
Of the Union Between the Soul and the Body 6:32 Gelesen von Owlivia
Different Systems Relative to This Subject 6:49 Gelesen von Owlivia
Examination of the System of Pre-Established Harmony an Objection to It 7:02 Gelesen von Owlivia
Another Objection 6:32 Gelesen von Owlivia
Of the Liberty of Spirits, and a Reply to Objections Against Liberty 6:40 Gelesen von Owlivia
Tne Same Subject Continued 7:17 Gelesen von Owlivia
Influence of the Liberty of Spirits Upon Events 7:45 Gelesen von Owlivia
Of Events Natural, Supernatural, and Moral 7:03 Gelesen von Owlivia
Of the Question Respecting the Best World Possible; and of the Origin of Evil 8:23 Gelesen von Owlivia
Connexion of the Preceding Considerations with Religion Reply to the Objections… 6:16 Gelesen von Owlivia
The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christia… 5:52 Gelesen von Owlivia
Elucidation Respecting the Nature of Spirits 8:14 Gelesen von Owlivia
The Subject Continued Reflections on the State of Souls After Death 9:03 Gelesen von Owlivia
Considerations on the Action of the Soul Upon the Body, and of the Body Upon th… 8:00 Gelesen von Owlivia
Of the Faculties of the Soul, and of Judgment 8:58 Gelesen von Owlivia
Conviction of the Existence of What We Perceive by the Senses of the Idealists,… 8:27 Gelesen von elizabethhousworth
Refutation of the Idealists 8:22 Gelesen von Constandina Sharpe
The Faculty of Perceiving, Reminiscence, Memory, and Attention Simple and Compo… 7:54 Gelesen von jenno
Division of Ideas into Clear and Obscure, Distinct and Confused of Distraction 7:07 Gelesen von jenno
Of the Abstraction of Notions Notions General and Individual: of Genus and Spec… 8:00 Gelesen von jenno
Of Language; Its Nature, Advantages, and Necessity, in Order to the Communicati… 8:39 Gelesen von Andrew Mauls Byron
Of the Perfections of a Language Judgment and Nature of Propositions, Affirmati… 7:59 Gelesen von Andrew Mauls Byron
Of Syllogisms, and Their Different Forms When the First Proposition is Universal 9:31 Gelesen von MaryAnn
Different Forms of Syllogisms Whose First Proposition is Particular 9:08 Gelesen von MaryAnn
Analysis of Some Syllogisms 7:15 Gelesen von MaryAnn
Different Figures and Modes of Syllogisms 11:03 Gelesen von MaryAnn
Observations and Reflections on the Different Modes of Syllogism 6:53 Gelesen von MaryAnn
Hypothetical Propositions, and Syllogisms Constructed of Them 8:48 Gelesen von SirRoni
Of the Impression of Sensations on the Soul 7:11 Gelesen von jenno
Of the Origin and Permission of Evil, and of Sin 9:30 Gelesen von SirRoni
Of Moral and Physical Evil 6:35 Gelesen von Larry Wilson
Reply to Complaints of the Existence of Physical Evil 6:14 Gelesen von Larry Wilson
The Real Destination of Man Usefulness and Necessity of Adversity 5:16 Gelesen von Larry Wilson
Of True Happiness. Conversion of Sinners. Reply to Objections on the Subject 6:32 Gelesen von Larry Wilson
The True Foundation of Human Knowledge Sources of Truth, and Classes of Informa… 5:29 Gelesen von Larry Wilson