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

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

Year of Publication: 1833Genres: Astronomy, Physics & Mechanics , Mathematics

Running Time: 14 hours 08 minutes 24 seconds

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