All Episodes
Eulers Letters to a German Princess, Vol. 1 — 115 episodes
115 - The True Foundation of Human Knowledge Sources of Truth and Classes of Information Derived from It
114 - Of True Happiness Conversion of Sinners Reply to Objections on the Subject
113 - The Real Destination of Man Usefulness and Necessity of Adversity
112 - Reply to Complaints of the Existence of Physical Evil
111 - Of Moral and Physical Evil
110 - Of the Origin and Permission of Evil and of Sin
109 - Of the Impression of Sensations on the Soul
108 - Hypothetical Propositions and Syllogisms Constructed of Them
107 - Observations and Reflections on the Different Modes of Syllogism
106 - Different Figures and Modes of Syllogisms
105 - Analysis of Some Syllogisms
104 - Different Forms of Syllogisms Whose First Proposition is Particular
103 - Of Syllogisms and Their Different Forms When the First Proposition is Universal
102 - Of the Perfections of a Language Judgment and Nature of Propositions Affirmative and Negative Univer
101 - Of Language Its Nature Advantages and Necessity in Order to the Communication of Thought and the Cul
100 - Of the Abstraction of Notions Notions General and Individual of Genus and Species
099 - Division of Ideas into Clear and Obscure Distinct and Confused of Distraction
098 - The Faculty of Perceiving Reminiscence Memory and Attention Simple and Compound Ideas
097 - Refutation of the Idealists
096 - Conviction of the Existence of What We Perceive by the Senses of the Idealists Egotists and Material
095 - Of the Faculties of the Soul and of Judgment
094 - Considerations on the Action of the Soul Upon the Body and of the Body Upon the Soul
093 - The Subject Continued Reflections on the State of Souls After Death
092 - Elucidation Respecting the Nature of Spirits
091 - The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christian Religion
090 - Connexion of the Preceding Considerations with Religion Reply to the Objections of the Philosophical
089 - Of the Question Respecting the Best World Possible and of the Origin of Evil
088 - Of Events Natural Supernatural and Moral
087 - Influence of the Liberty of Spirits Upon Events
086 - Tne Same Subject Continued
085 - Of the Liberty of Spirits and a Reply to Objections Against Liberty
084 - Another Objection
083 - Examination of the System of Pre-Established Harmony an Objection to It
082 - Different Systems Relative to This Subject
081 - Of the Union Between the Soul and the Body
080 - Of the Nature of Spirits
079 - On the Question are There Any Other Species of Powers
078 - The Same Subject Principle of the Least Possible Action
077 - Origin and Nature of Powers
076 - System of the Monads of Wolff
075 - Changes Which May Take Place in the State of Bodies
074 - Of the Inertia of Bodies of Powers
073 - Principal Law of Motion and Rest Disputes of Philosophers on the Subject
072 - Of Uniform Accelerated and Retarded Motion
071 - Of the Motion of Bodies Real and Apparent
070 - Impenetrability of Bodies
069 - Nature and Essence of Bodies or Extension Mobility and Impenetrability of Body
068 - More Particular Account of the Dispute Respecting Universal Gravitation
067 - The Same Subject Continued
066 - The Same Subject Continued
065 - The Same Subject Continued
064 - Explanation of the Flux and Reflux from the Attractive Power of the Moon
063 - Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea
062 - Description of the Flux and Reflux of the Sea
061 - Small Irregularities in the Motions of the Planets Caused by Their Mutual Attraction
060 - The Same Subject Continued
059 - System of the Universe
058 - Motion of the Heavenly Bodies Method of Determining It by the Laws of Universal Gravitation
057 - The Same Subject Continued
056 - The Same Subject Continued
055 - Power by Which the Heavenly Bodies an Mutually Attracted
054 - Different Sentiments of Philosophers Respecting Universal Gravitation the Attractionists
053 - Continuation of the Mutual Attraction of the Heavenly Bodies
052 - Discovery of Universal Gravitation by Newton
051 - Gravity of the Moon
050 - Different Action of Gravity with Respect to Certain Countries and Distances from the Centre of the E
049 - True Direction and Action of Gravity Relatively to the Earth
048 - Reply to Certain Objections to the Erath's Spherical Figure Derived from Gravity
047 - Terms Relative to Gravity and Their True Import
046 - Continuation of Specific Gravity
045 - Of Gravity Considered as a General Property of Body
044 - Perfections Discoverable in the Structure of the Eye
043 - Further Continuation Astonishing Difference Between the Eye of an Animal and the Artificial Eye or C
042 - Continuation Wonders Discoverable in the Structure of the Eye
041 - Of Vision and the Structure of the Eye
040 - Continuation of Burning Glasses and Their Focus
039 - Of Dioptrics
038 - Reflection of Rays from Convex and Concave Mirrors Burning Mirrors
037 - Of Catoptrics and the Reflection of Rays from Plain Mirrors
036 - Of Shadow
035 - Explanation of Certain Phenomena Relative to Optics
034 - Of the Assistance Which Judgment Lends to Vision
033 - Of Rays Issuing from a Distant Luminous Point and of the Visual Angle
032 - Of the Azure Colour of the Heavens
031 - Refraction of Rays of Different Colours
030 - Of the Transmission of Rays of Light Through Transparent Mediums and Their Refraction
029 - Transparency of Bodies Relative to the Transmission of Rays
028 - Nature of Colours in Particular
027 - Conclusion Clearness and Colour of Opaque Bodies Illuminated
026 - Continuation of the Same Subject
025 - A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become Visible
024 - Examination and Refutation of Newton's System
023 - How Opaque Bodies Become Visible Newton's System of the Reflection of Rays Proposed
022 - Elucidations on the Nature of Luminous Bodies and Their Difference from Opaque Bodies Illuminated
021 - Digression on the Distances of the Heavenly Bodies and on the Nature of the Sun and His Rays
020 - Of the Propagation of Light
019 - A Different System Respecting the Nature of Rays and of Light Proposed
018 - Difficulties Attending the System of Emanation
017 - Of Light and the Systems of Descartes and Newton
016 - The Cold Felt on High Mountains and at Great Depths Accounted For
015 - Changes Produced in the Atmosphere by Heat and Cold
014 - The Effect Produced by Heat and Cold on All Bodies and Of the Pyrometer and Thermometer
013 - Of Air-Guns and the Compression of Air in Gunpowder
012 - Of the Atmosphere and the Barometer
011 - Gravity of the Air
010 - Rarefaction and Elasticity of the Air
009 - Compression of the Air
008 - Of the Pleasure Derived from Fine Music
007 - Of the Twelve Tones of the Harpsichord
006 - Of Other Consonances
005 - Of Unison and Octaves
004 - Of Consonance and Dissonance
003 - Of Sound and Its Velocity
002 - Of Velocity
001 - Of Magnitude or Extension