Letters on Different Subjects in Natural Philosophy, Volume 1 (Letters to a German Princess)


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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

Chapitres

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Of Magnitude, or Extension 7:47 Lu par Elijah Fisher
Of Velocity 7:07 Lu par Elijah Fisher
Of Sound, and Its Velocity 7:52 Lu par Elijah Fisher
Of Consonance and Dissonance 6:28 Lu par Elijah Fisher
Of Unison and Octaves 8:10 Lu par Elijah Fisher
Of Other Consonances 9:14 Lu par Cbteddy
Of the Twelve Tones of the Harpsichord 13:19 Lu par Cbteddy
Of the Pleasure Derived from Fine Music 5:55 Lu par Cbteddy
Compression of the Air 7:23 Lu par prajak
Rarefaction and Elasticity of the Air 8:16 Lu par prajak
Gravity of the Air 7:01 Lu par prajak
Of the Atmosphere, and the Barometer 6:18 Lu par Elijah Fisher
Of Air-Guns, and the Compression of Air in Gunpowder 6:43 Lu par Elijah Fisher
The Effect Produced by Heat and Cold on All Bodies, and Of, the Pyrometer and Thermometer 5:31 Lu par Elijah Fisher
Changes Produced in the Atmosphere by Heat and Cold 7:48 Lu par Elijah Fisher
The Cold Felt on High Mountains and at Great Depths Accounted For 7:25 Lu par Elijah Fisher
Of Light, and the Systems of Descartes and Newton 6:54 Lu par Bonnie de Lyons
Difficulties Attending the System of Emanation 6:36 Lu par Bonnie de Lyons
A Different System Respecting the Nature of Rays and of Light Proposed 7:31 Lu par Bonnie de Lyons
Of the Propagation of Light 6:42 Lu par Bonnie de Lyons
Digression on the Distances of the Heavenly Bodies, and on the Nature of the Sun and His Rays 6:15 Lu par czandra
Elucidations on the Nature of Luminous Bodies, and Their Difference from Opaque Bodies Illuminated 7:16 Lu par Verla Viera
How Opaque Bodies Become Visible Newton's System of the Reflection of Rays Proposed 8:34 Lu par Jayjaysil
Examination and Refutation of Newton's System 11:36 Lu par Emanuela
A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become Visible 7:44 Lu par Emanuela
Continuation of the Same Subject 8:50 Lu par Emanuela
Conclusion: Clearness and Colour of Opaque Bodies Illuminated 9:37 Lu par Emanuela
Nature of Colours in Particular 6:28 Lu par czandra
Transparency of Bodies Relative to the Transmission of Rays 8:32 Lu par Elijah Fisher
Of the Transmission of Rays of Light Through Transparent Mediums, and Their Refraction 8:04 Lu par Elijah Fisher
Refraction of Rays of Different Colours 7:14 Lu par Elijah Fisher
Of the Azure Colour of the Heavens 8:54 Lu par czandra
Of Rays Issuing from a Distant Luminous Point, and of the Visual Angle 6:34 Lu par Elijah Fisher
Of the Assistance Which Judgment Lends to Vision 6:43 Lu par Elijah Fisher
Explanation of Certain Phenomena Relative to Optics 7:29 Lu par Elijah Fisher
Of Shadow 7:16 Lu par Elijah Fisher
Of Catoptrics, and the Reflection of Rays from Plain Mirrors 8:24 Lu par Elijah Fisher
Reflection of Rays from Convex and Concave Mirrors Burning Mirrors 8:04 Lu par Elijah Fisher
Of Dioptrics 8:36 Lu par Elijah Fisher
Continuation of Burning — Glasses, and Their Focus 7:12 Lu par Elijah Fisher
Of Vision, and the Structure of the Eye 5:24 Lu par Elijah Fisher
Continuation Wonders Discoverable in the Structure of the Eye 6:07 Lu par Elijah Fisher
Further Continuation Astonishing Difference Between the Eye of an Animal and the Artificial Eye, or Camera Obscura 6:44 Lu par Elijah Fisher
Perfections Discoverable in the Structure of the Eye 4:40 Lu par Elijah Fisher
Of Gravity, Considered as a General Property of Body 6:58 Lu par Elijah Fisher
Continuation of Specific Gravity 6:55 Lu par Elijah Fisher
Terms Relative to Gravity and Their True Import 6:29 Lu par Elijah Fisher
Reply to Certain Objections to the Erath's Spherical Figure, Derived from Gravity 6:17 Lu par Jayjaysil
True Direction and Action of Gravity Relatively to the Earth 6:52 Lu par Verla Viera
Different Action of Gravity with Respect to Certain Countries and Distances from the Centre of the Earth 7:57 Lu par Verla Viera
Gravity of the Moon 5:33 Lu par Verla Viera
Discovery of Universal Gravitation by Newton 9:08 Lu par SirRoni
Continuation of the Mutual Attraction of the Heavenly Bodies 9:18 Lu par prajak
Different Sentiments of Philosophers Respecting Universal Gravitation the Attractionists 7:04 Lu par prajak
Power by Which the Heavenly Bodies an Mutually Attracted 4:08 Lu par prajak
The Same Subject Continued 6:41 Lu par prajak
The Same Subject Continued 6:37 Lu par prajak
Motion of the Heavenly Bodies Method of Determining It by the Laws of Universal Gravitation 4:56 Lu par Cbteddy
System of the Universe 6:40 Lu par Cbteddy
The Same Subject Continued 5:29 Lu par Cbteddy
Small Irregularities in the Motions of the Planets, Caused by Their Mutual Attraction 5:59 Lu par Cbteddy
Description of the Flux and Reflux of the Sea 6:45 Lu par Belinda Mc
Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea 6:22 Lu par Belinda Mc
Explanation of the Flux and Reflux, from the Attractive Power of the Moon 5:33 Lu par Verla Viera
The Same Subject Continued 5:06 Lu par Verla Viera
The Same Subject Continued 6:17 Lu par Verla Viera
The Same Subject Continued 6:15 Lu par Verla Viera
More Particular Account of the Dispute Respecting Universal Gravitation 7:05 Lu par Ty Lasky
Nature and Essence of Bodies or Extension, Mobility, and Impenetrability of Body 7:33 Lu par ShrimpPhish
Impenetrability of Bodies 5:40 Lu par ShrimpPhish
Of the Motion of Bodies, Real and Apparent 8:16 Lu par ShrimpPhish
Of Uniform, Accelerated, and Retarded Motion 12:33 Lu par SirRoni
Principal Law of Motion and Rest Disputes of Philosophers on the Subject 8:02 Lu par jenno
Of the Inertia of Bodies of Powers 7:47 Lu par jenno
Changes Which May Take Place in the State of Bodies 8:05 Lu par elizabethhousworth
System of the Monads of Wolff 8:09 Lu par elizabethhousworth
Origin and Nature of Powers 7:11 Lu par Cajucom
The Same Subject Principle of the Least Possible Action 7:16 Lu par jenno
On the Question, are There Any Other Species of Powers? 7:40 Lu par jenno
Of the Nature of Spirits 5:12 Lu par Owlivia
Of the Union Between the Soul and the Body 6:32 Lu par Owlivia
Different Systems Relative to This Subject 6:49 Lu par Owlivia
Examination of the System of Pre-Established Harmony an Objection to It 7:02 Lu par Owlivia
Another Objection 6:32 Lu par Owlivia
Of the Liberty of Spirits, and a Reply to Objections Against Liberty 6:40 Lu par Owlivia
Tne Same Subject Continued 7:17 Lu par Owlivia
Influence of the Liberty of Spirits Upon Events 7:45 Lu par Owlivia
Of Events Natural, Supernatural, and Moral 7:03 Lu par Owlivia
Of the Question Respecting the Best World Possible; and of the Origin of Evil 8:23 Lu par Owlivia
Connexion of the Preceding Considerations with Religion Reply to the Objections of the Philosophical Systems Against Prayer 6:16 Lu par Owlivia
The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christian Religion 5:52 Lu par Owlivia
Elucidation Respecting the Nature of Spirits 8:14 Lu par Owlivia
The Subject Continued Reflections on the State of Souls After Death 9:03 Lu par Owlivia
Considerations on the Action of the Soul Upon the Body, and of the Body Upon the Soul 8:00 Lu par Owlivia
Of the Faculties of the Soul, and of Judgment 8:58 Lu par Owlivia
Conviction of the Existence of What We Perceive by the Senses of the Idealists, Egotists, and Materialists 8:27 Lu par elizabethhousworth
Refutation of the Idealists 8:22 Lu par Constandina Sharpe
The Faculty of Perceiving, Reminiscence, Memory, and Attention Simple and Compound Ideas 7:54 Lu par jenno
Division of Ideas into Clear and Obscure, Distinct and Confused of Distraction 7:07 Lu par jenno
Of the Abstraction of Notions Notions General and Individual: of Genus and Species 8:00 Lu par jenno
Of Language; Its Nature, Advantages, and Necessity, in Order to the Communication of Thought, and the Cultivation of Knowledge 8:39 Lu par Andrew Mauls Byron
Of the Perfections of a Language Judgment and Nature of Propositions, Affirmative and Negative, Universal or Particular 7:59 Lu par Andrew Mauls Byron
Of Syllogisms, and Their Different Forms When the First Proposition is Universal 9:31 Lu par MaryAnn
Different Forms of Syllogisms Whose First Proposition is Particular 9:08 Lu par MaryAnn
Analysis of Some Syllogisms 7:15 Lu par MaryAnn
Different Figures and Modes of Syllogisms 11:03 Lu par MaryAnn
Observations and Reflections on the Different Modes of Syllogism 6:53 Lu par MaryAnn
Hypothetical Propositions, and Syllogisms Constructed of Them 8:48 Lu par SirRoni
Of the Impression of Sensations on the Soul 7:11 Lu par jenno
Of the Origin and Permission of Evil, and of Sin 9:30 Lu par SirRoni
Of Moral and Physical Evil 6:35 Lu par Larry Wilson
Reply to Complaints of the Existence of Physical Evil 6:14 Lu par Larry Wilson
The Real Destination of Man Usefulness and Necessity of Adversity 5:16 Lu par Larry Wilson
Of True Happiness. Conversion of Sinners. Reply to Objections on the Subject 6:32 Lu par Larry Wilson
The True Foundation of Human Knowledge Sources of Truth, and Classes of Information Derived from It 5:29 Lu par Larry Wilson