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

Leonhard Euler (1707 - 1783)
Translated by Henry Hunter (1741 - 1802)

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

Genre(s): Mathematics, Astronomy, Physics & Mechanics

Language: English

Section	Chapter	Reader	Time
Play 01	Of Magnitude, or Extension	Elijah Fisher	00:07:47
Play 02	Of Velocity	Elijah Fisher	00:07:07
Play 03	Of Sound, and Its Velocity	Elijah Fisher	00:07:52
Play 04	Of Consonance and Dissonance	Elijah Fisher	00:06:28
Play 05	Of Unison and Octaves	Elijah Fisher	00:08:10
Play 06	Of Other Consonances	Cbteddy	00:09:14
Play 07	Of the Twelve Tones of the Harpsichord	Cbteddy	00:13:19
Play 08	Of the Pleasure Derived from Fine Music	Cbteddy	00:05:55
Play 09	Compression of the Air	prajak	00:07:23
Play 10	Rarefaction and Elasticity of the Air	prajak	00:08:16
Play 11	Gravity of the Air	prajak	00:07:01
Play 12	Of the Atmosphere, and the Barometer	Elijah Fisher	00:06:18
Play 13	Of Air-Guns, and the Compression of Air in Gunpowder	Elijah Fisher	00:06:43
Play 14	The Effect Produced by Heat and Cold on All Bodies, and Of, the Pyrometer and Thermometer	Elijah Fisher	00:05:31
Play 15	Changes Produced in the Atmosphere by Heat and Cold	Elijah Fisher	00:07:48
Play 16	The Cold Felt on High Mountains and at Great Depths Accounted For	Elijah Fisher	00:07:25
Play 17	Of Light, and the Systems of Descartes and Newton	Bonnie de Lyons	00:06:54
Play 18	Difficulties Attending the System of Emanation	Bonnie de Lyons	00:06:36
Play 19	A Different System Respecting the Nature of Rays and of Light Proposed	Bonnie de Lyons	00:07:31
Play 20	Of the Propagation of Light	Bonnie de Lyons	00:06:42
Play 21	Digression on the Distances of the Heavenly Bodies, and on the Nature of the Sun and His Rays	czandra	00:06:15
Play 22	Elucidations on the Nature of Luminous Bodies, and Their Difference from Opaque Bodies Illuminated	Verla Viera	00:07:16
Play 23	How Opaque Bodies Become Visible Newton's System of the Reflection of Rays Proposed	Jayjaysil	00:08:34
Play 24	Examination and Refutation of Newton's System	Emanuela	00:11:36
Play 25	A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become Visible	Emanuela	00:07:44
Play 26	Continuation of the Same Subject	Emanuela	00:08:50
Play 27	Conclusion: Clearness and Colour of Opaque Bodies Illuminated	Emanuela	00:09:37
Play 28	Nature of Colours in Particular	czandra	00:06:28
Play 29	Transparency of Bodies Relative to the Transmission of Rays	Elijah Fisher	00:08:32
Play 30	Of the Transmission of Rays of Light Through Transparent Mediums, and Their Refraction	Elijah Fisher	00:08:04
Play 31	Refraction of Rays of Different Colours	Elijah Fisher	00:07:14
Play 32	Of the Azure Colour of the Heavens	czandra	00:08:54
Play 33	Of Rays Issuing from a Distant Luminous Point, and of the Visual Angle	Elijah Fisher	00:06:34
Play 34	Of the Assistance Which Judgment Lends to Vision	Elijah Fisher	00:06:43
Play 35	Explanation of Certain Phenomena Relative to Optics	Elijah Fisher	00:07:29
Play 36	Of Shadow	Elijah Fisher	00:07:16
Play 37	Of Catoptrics, and the Reflection of Rays from Plain Mirrors	Elijah Fisher	00:08:24
Play 38	Reflection of Rays from Convex and Concave Mirrors Burning Mirrors	Elijah Fisher	00:08:04
Play 39	Of Dioptrics	Elijah Fisher	00:08:36
Play 40	Continuation of Burning — Glasses, and Their Focus	Elijah Fisher	00:07:12
Play 41	Of Vision, and the Structure of the Eye	Elijah Fisher	00:05:24
Play 42	Continuation Wonders Discoverable in the Structure of the Eye	Elijah Fisher	00:06:07
Play 43	Further Continuation Astonishing Difference Between the Eye of an Animal and the Artificial Eye, or Camera Obscura	Elijah Fisher	00:06:44
Play 44	Perfections Discoverable in the Structure of the Eye	Elijah Fisher	00:04:40
Play 45	Of Gravity, Considered as a General Property of Body	Elijah Fisher	00:06:58
Play 46	Continuation of Specific Gravity	Elijah Fisher	00:06:55
Play 47	Terms Relative to Gravity and Their True Import	Elijah Fisher	00:06:29
Play 48	Reply to Certain Objections to the Erath's Spherical Figure, Derived from Gravity	Jayjaysil	00:06:17
Play 49	True Direction and Action of Gravity Relatively to the Earth	Verla Viera	00:06:52
Play 50	Different Action of Gravity with Respect to Certain Countries and Distances from the Centre of the Earth	Verla Viera	00:07:57
Play 51	Gravity of the Moon	Verla Viera	00:05:33
Play 52	Discovery of Universal Gravitation by Newton	SirRoni	00:09:08
Play 53	Continuation of the Mutual Attraction of the Heavenly Bodies	prajak	00:09:18
Play 54	Different Sentiments of Philosophers Respecting Universal Gravitation the Attractionists	prajak	00:07:04
Play 55	Power by Which the Heavenly Bodies an Mutually Attracted	prajak	00:04:08
Play 56	The Same Subject Continued	prajak	00:06:41
Play 57	The Same Subject Continued	prajak	00:06:37
Play 58	Motion of the Heavenly Bodies Method of Determining It by the Laws of Universal Gravitation	Cbteddy	00:04:56
Play 59	System of the Universe	Cbteddy	00:06:40
Play 60	The Same Subject Continued	Cbteddy	00:05:29
Play 61	Small Irregularities in the Motions of the Planets, Caused by Their Mutual Attraction	Cbteddy	00:05:59
Play 62	Description of the Flux and Reflux of the Sea	Belinda Mc	00:06:45
Play 63	Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea	Belinda Mc	00:06:22
Play 64	Explanation of the Flux and Reflux, from the Attractive Power of the Moon	Verla Viera	00:05:33
Play 65	The Same Subject Continued	Verla Viera	00:05:06
Play 66	The Same Subject Continued	Verla Viera	00:06:17
Play 67	The Same Subject Continued	Verla Viera	00:06:15
Play 68	More Particular Account of the Dispute Respecting Universal Gravitation	Ty Lasky	00:07:05
Play 69	Nature and Essence of Bodies or Extension, Mobility, and Impenetrability of Body	ShrimpPhish	00:07:33
Play 70	Impenetrability of Bodies	ShrimpPhish	00:05:40
Play 71	Of the Motion of Bodies, Real and Apparent	ShrimpPhish	00:08:16
Play 72	Of Uniform, Accelerated, and Retarded Motion	SirRoni	00:12:33
Play 73	Principal Law of Motion and Rest Disputes of Philosophers on the Subject	jenno	00:08:02
Play 74	Of the Inertia of Bodies of Powers	jenno	00:07:47
Play 75	Changes Which May Take Place in the State of Bodies	elizabethhousworth	00:08:05
Play 76	System of the Monads of Wolff	elizabethhousworth	00:08:09
Play 77	Origin and Nature of Powers	Cajucom	00:07:11
Play 78	The Same Subject Principle of the Least Possible Action	jenno	00:07:16
Play 79	On the Question, are There Any Other Species of Powers?	jenno	00:07:40
Play 80	Of the Nature of Spirits	Owlivia	00:05:12
Play 81	Of the Union Between the Soul and the Body	Owlivia	00:06:32
Play 82	Different Systems Relative to This Subject	Owlivia	00:06:49
Play 83	Examination of the System of Pre-Established Harmony an Objection to It	Owlivia	00:07:02
Play 84	Another Objection	Owlivia	00:06:32
Play 85	Of the Liberty of Spirits, and a Reply to Objections Against Liberty	Owlivia	00:06:40
Play 86	Tne Same Subject Continued	Owlivia	00:07:17
Play 87	Influence of the Liberty of Spirits Upon Events	Owlivia	00:07:45
Play 88	Of Events Natural, Supernatural, and Moral	Owlivia	00:07:03
Play 89	Of the Question Respecting the Best World Possible; and of the Origin of Evil	Owlivia	00:08:23
Play 90	Connexion of the Preceding Considerations with Religion Reply to the Objections of the Philosophical Systems Against Prayer	Owlivia	00:06:16
Play 91	The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christian Religion	Owlivia	00:05:52
Play 92	Elucidation Respecting the Nature of Spirits	Owlivia	00:08:14
Play 93	The Subject Continued Reflections on the State of Souls After Death	Owlivia	00:09:03
Play 94	Considerations on the Action of the Soul Upon the Body, and of the Body Upon the Soul	Owlivia	00:08:00
Play 95	Of the Faculties of the Soul, and of Judgment	Owlivia	00:08:58
Play 96	Conviction of the Existence of What We Perceive by the Senses of the Idealists, Egotists, and Materialists	elizabethhousworth	00:08:27
Play 97	Refutation of the Idealists	Constandina Sharpe	00:08:22
Play 98	The Faculty of Perceiving, Reminiscence, Memory, and Attention Simple and Compound Ideas	jenno	00:07:54
Play 99	Division of Ideas into Clear and Obscure, Distinct and Confused of Distraction	jenno	00:07:07
Play 100	Of the Abstraction of Notions Notions General and Individual: of Genus and Species	jenno	00:08:00
Play 101	Of Language; Its Nature, Advantages, and Necessity, in Order to the Communication of Thought, and the Cultivation of Knowledge	Andrew Mauls Byron	00:08:39
Play 102	Of the Perfections of a Language Judgment and Nature of Propositions, Affirmative and Negative, Universal or Particular	Andrew Mauls Byron	00:07:59
Play 103	Of Syllogisms, and Their Different Forms When the First Proposition is Universal	MaryAnn	00:09:31
Play 104	Different Forms of Syllogisms Whose First Proposition is Particular	MaryAnn	00:09:08
Play 105	Analysis of Some Syllogisms	MaryAnn	00:07:15
Play 106	Different Figures and Modes of Syllogisms	MaryAnn	00:11:03
Play 107	Observations and Reflections on the Different Modes of Syllogism	MaryAnn	00:06:53
Play 108	Hypothetical Propositions, and Syllogisms Constructed of Them	SirRoni	00:08:48
Play 109	Of the Impression of Sensations on the Soul	jenno	00:07:11
Play 110	Of the Origin and Permission of Evil, and of Sin	SirRoni	00:09:30
Play 111	Of Moral and Physical Evil	Larry Wilson	00:06:35
Play 112	Reply to Complaints of the Existence of Physical Evil	Larry Wilson	00:06:14
Play 113	The Real Destination of Man Usefulness and Necessity of Adversity	Larry Wilson	00:05:16
Play 114	Of True Happiness. Conversion of Sinners. Reply to Objections on the Subject	Larry Wilson	00:06:32
Play 115	The True Foundation of Human Knowledge Sources of Truth, and Classes of Information Derived from It	Larry Wilson	00:05:29

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