Letters on Different Subjects in Natural Philosophy, Volume 1 (Letters to a German Princess)
Leonhard Euler
Play
Length 14 h 8 min
Chapters 115
First published 1833
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
Chapters
1
Of Magnitude, or Extension Read by Elijah Fisher 7:47
2
Of Velocity Read by Elijah Fisher 7:07
3
Of Sound, and Its Velocity Read by Elijah Fisher 7:52
4
Of Consonance and Dissonance Read by Elijah Fisher 6:28
5
Of Unison and Octaves Read by Elijah Fisher 8:10
6
Of Other Consonances Read by Cbteddy 9:14
7
Of the Twelve Tones of the Harpsichord Read by Cbteddy 13:19
8
Of the Pleasure Derived from Fine Music Read by Cbteddy 5:55
9
Compression of the Air Read by prajak 7:23
10
Rarefaction and Elasticity of the Air Read by prajak 8:16
11
Gravity of the Air Read by prajak 7:01
12
Of the Atmosphere, and the Barometer Read by Elijah Fisher 6:18
13
Of Air-Guns, and the Compression of Air in Gunpowder Read by Elijah Fisher 6:43
14
The Effect Produced by Heat and Cold on All Bodies, and Of, the Pyrometer and Thermometer Read by Elijah Fisher 5:31
15
Changes Produced in the Atmosphere by Heat and Cold Read by Elijah Fisher 7:48
16
The Cold Felt on High Mountains and at Great Depths Accounted For Read by Elijah Fisher 7:25
17
Of Light, and the Systems of Descartes and Newton Read by Bonnie de Lyons 6:54
18
Difficulties Attending the System of Emanation Read by Bonnie de Lyons 6:36
19
A Different System Respecting the Nature of Rays and of Light Proposed Read by Bonnie de Lyons 7:31
20
Of the Propagation of Light Read by Bonnie de Lyons 6:42
21
Digression on the Distances of the Heavenly Bodies, and on the Nature of the Sun and His Rays Read by czandra 6:15
22
Elucidations on the Nature of Luminous Bodies, and Their Difference from Opaque Bodies Illuminated Read by Verla Viera 7:16
23
How Opaque Bodies Become Visible Newton's System of the Reflection of Rays Proposed Read by Jayjaysil 8:34
24
Examination and Refutation of Newton's System Read by Emanuela 11:36
25
A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become Visible Read by Emanuela 7:44
26
Continuation of the Same Subject Read by Emanuela 8:50
27
Conclusion: Clearness and Colour of Opaque Bodies Illuminated Read by Emanuela 9:37
28
Nature of Colours in Particular Read by czandra 6:28
29
Transparency of Bodies Relative to the Transmission of Rays Read by Elijah Fisher 8:32
30
Of the Transmission of Rays of Light Through Transparent Mediums, and Their Refraction Read by Elijah Fisher 8:04
31
Refraction of Rays of Different Colours Read by Elijah Fisher 7:14
32
Of the Azure Colour of the Heavens Read by czandra 8:54
33
Of Rays Issuing from a Distant Luminous Point, and of the Visual Angle Read by Elijah Fisher 6:34
34
Of the Assistance Which Judgment Lends to Vision Read by Elijah Fisher 6:43
35
Explanation of Certain Phenomena Relative to Optics Read by Elijah Fisher 7:29
36
Of Shadow Read by Elijah Fisher 7:16
37
Of Catoptrics, and the Reflection of Rays from Plain Mirrors Read by Elijah Fisher 8:24
38
Reflection of Rays from Convex and Concave Mirrors Burning Mirrors Read by Elijah Fisher 8:04
39
Of Dioptrics Read by Elijah Fisher 8:36
40
Continuation of Burning — Glasses, and Their Focus Read by Elijah Fisher 7:12
41
Of Vision, and the Structure of the Eye Read by Elijah Fisher 5:24
42
Continuation Wonders Discoverable in the Structure of the Eye Read by Elijah Fisher 6:07
43
Further Continuation Astonishing Difference Between the Eye of an Animal and the Artificial Eye, or Camera Obscura Read by Elijah Fisher 6:44
44
Perfections Discoverable in the Structure of the Eye Read by Elijah Fisher 4:40
45
Of Gravity, Considered as a General Property of Body Read by Elijah Fisher 6:58
46
Continuation of Specific Gravity Read by Elijah Fisher 6:55
47
Terms Relative to Gravity and Their True Import Read by Elijah Fisher 6:29
48
Reply to Certain Objections to the Erath's Spherical Figure, Derived from Gravity Read by Jayjaysil 6:17
49
True Direction and Action of Gravity Relatively to the Earth Read by Verla Viera 6:52
50
Different Action of Gravity with Respect to Certain Countries and Distances from the Centre of the Earth Read by Verla Viera 7:57
51
Gravity of the Moon Read by Verla Viera 5:33
52
Discovery of Universal Gravitation by Newton Read by SirRoni 9:08
53
Continuation of the Mutual Attraction of the Heavenly Bodies Read by prajak 9:18
54
Different Sentiments of Philosophers Respecting Universal Gravitation the Attractionists Read by prajak 7:04
55
Power by Which the Heavenly Bodies an Mutually Attracted Read by prajak 4:08
56
The Same Subject Continued Read by prajak 6:41
57
The Same Subject Continued Read by prajak 6:37
58
Motion of the Heavenly Bodies Method of Determining It by the Laws of Universal Gravitation Read by Cbteddy 4:56
59
System of the Universe Read by Cbteddy 6:40
60
The Same Subject Continued Read by Cbteddy 5:29
61
Small Irregularities in the Motions of the Planets, Caused by Their Mutual Attraction Read by Cbteddy 5:59
62
Description of the Flux and Reflux of the Sea Read by Belinda McReynolds 6:45
63
Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea Read by Belinda McReynolds 6:22
64
Explanation of the Flux and Reflux, from the Attractive Power of the Moon Read by Verla Viera 5:33
65
The Same Subject Continued Read by Verla Viera 5:06
66
The Same Subject Continued Read by Verla Viera 6:17
67
The Same Subject Continued Read by Verla Viera 6:15
68
More Particular Account of the Dispute Respecting Universal Gravitation Read by Ty Lasky 7:05
69
Nature and Essence of Bodies or Extension, Mobility, and Impenetrability of Body Read by ShrimpPhish 7:33
70
Impenetrability of Bodies Read by ShrimpPhish 5:40
71
Of the Motion of Bodies, Real and Apparent Read by ShrimpPhish 8:16
72
Of Uniform, Accelerated, and Retarded Motion Read by SirRoni 12:33
73
Principal Law of Motion and Rest Disputes of Philosophers on the Subject Read by jenno 8:02
74
Of the Inertia of Bodies of Powers Read by jenno 7:47
75
Changes Which May Take Place in the State of Bodies Read by elizabethhousworth 8:05
76
System of the Monads of Wolff Read by elizabethhousworth 8:09
77
Origin and Nature of Powers Read by Cajucom 7:11
78
The Same Subject Principle of the Least Possible Action Read by jenno 7:16
79
On the Question, are There Any Other Species of Powers? Read by jenno 7:40
80
Of the Nature of Spirits Read by Owlivia 5:12
81
Of the Union Between the Soul and the Body Read by Owlivia 6:32
82
Different Systems Relative to This Subject Read by Owlivia 6:49
83
Examination of the System of Pre-Established Harmony an Objection to It Read by Owlivia 7:02
84
Another Objection Read by Owlivia 6:32
85
Of the Liberty of Spirits, and a Reply to Objections Against Liberty Read by Owlivia 6:40
86
Tne Same Subject Continued Read by Owlivia 7:17
87
Influence of the Liberty of Spirits Upon Events Read by Owlivia 7:45
88
Of Events Natural, Supernatural, and Moral Read by Owlivia 7:03
89
Of the Question Respecting the Best World Possible; and of the Origin of Evil Read by Owlivia 8:23
90
Connexion of the Preceding Considerations with Religion Reply to the Objections of the Philosophical Systems Against Prayer Read by Owlivia 6:16
91
The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christian Religion Read by Owlivia 5:52
92
Elucidation Respecting the Nature of Spirits Read by Owlivia 8:14
93
The Subject Continued Reflections on the State of Souls After Death Read by Owlivia 9:03
94
Considerations on the Action of the Soul Upon the Body, and of the Body Upon the Soul Read by Owlivia 8:00
95
Of the Faculties of the Soul, and of Judgment Read by Owlivia 8:58
96
Conviction of the Existence of What We Perceive by the Senses of the Idealists, Egotists, and Materialists Read by elizabethhousworth 8:27
97
Refutation of the Idealists Read by Constandina Sharpe 8:22
98
The Faculty of Perceiving, Reminiscence, Memory, and Attention Simple and Compound Ideas Read by jenno 7:54
99
Division of Ideas into Clear and Obscure, Distinct and Confused of Distraction Read by jenno 7:07
100
Of the Abstraction of Notions Notions General and Individual: of Genus and Species Read by jenno 8:00
101
Of Language; Its Nature, Advantages, and Necessity, in Order to the Communication of Thought, and the Cultivation of Knowledge Read by Andrew Mauls Byron 8:39
102
Of the Perfections of a Language Judgment and Nature of Propositions, Affirmative and Negative, Universal or Particular Read by Andrew Mauls Byron 7:59
103
Of Syllogisms, and Their Different Forms When the First Proposition is Universal Read by MaryAnn 9:31
104
Different Forms of Syllogisms Whose First Proposition is Particular Read by MaryAnn 9:08
105
Analysis of Some Syllogisms Read by MaryAnn 7:15
106
Different Figures and Modes of Syllogisms Read by MaryAnn 11:03
107
Observations and Reflections on the Different Modes of Syllogism Read by MaryAnn 6:53
108
Hypothetical Propositions, and Syllogisms Constructed of Them Read by SirRoni 8:48
109
Of the Impression of Sensations on the Soul Read by jenno 7:11
110
Of the Origin and Permission of Evil, and of Sin Read by SirRoni 9:30
111
Of Moral and Physical Evil Read by Larry Wilson 6:35
112
Reply to Complaints of the Existence of Physical Evil Read by Larry Wilson 6:14
113
The Real Destination of Man Usefulness and Necessity of Adversity Read by Larry Wilson 5:16
114
Of True Happiness. Conversion of Sinners. Reply to Objections on the Subject Read by Larry Wilson 6:32
115
The True Foundation of Human Knowledge Sources of Truth, and Classes of Information Derived from It Read by Larry Wilson 5:29
From LibriVox, read by volunteers and in the public domain. LibriVox page (opens librivox.org) , the text (opens archive.org) , all files on the Internet Archive (opens archive.org) .
