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

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