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  • Title: Prefatory Note: First Scientific Lecture-Course
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    • young in mind and in ideal — those above all who seek
  • Title: First Lecture (First Scientific Lecture-Course)
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    • you in forming your outlook upon Nature. I hope that in no very
    • distant future we shall be able to continue. On this occasion, as you
    • contribute may well be of use to those of you who are teachers and
    • educators, — not to apply directly in your lessons, but as a
    • fundamental trend and tendency in Science, which should permeate your
    • be my specific aim to help you understand that contrast between the
    • Nature. You need only recall how in external, sensory experience so
    • the properties of this ether. Now you are well aware how very
    • things we really must reach clarity. You see, dear Friends, along the
    • for you to be clear on this point, — to realize that Kinematics
    • movements. You need not observe any process in outer Nature; you can
    • simply think it — picture it to yourself in thought — how
    • outer drawing; I could simply have instructed you in thought to form
    • the mental picture; you could not but have found it valid. Yet if in
    • And now I beg you to
    • pulling from a to b, to be five grammes; you can
    • the world of facts. If once you realize this difference between the
    • Forces, you have a clear and sharp formulation of the essential
    • mental pictures. You can reach movements but not forces with your
    • mental activity. Forces you have to measure in the outer world. The
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  • Title: Second Lecture (First Scientific Lecture-Course)
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    • space and time, is a movement in the ether. Yet if you look it up in
    • about the phenomena of light, you will find contradictory and
    • those among you who may no longer recall it from your school days can
    • simply adduce the essential elements to bring the formula before your
    • us above all is this: — (I am reminding you of a formula which
    • you most probably know; I only call it to your mind.) Multiply the
    • side of this formula. You see in it the mass. You see from the
    • — no real physiology. It does not know the human being. You
    • you can indeed, but your first step must be to make yourself more
    • consciously aware of this: — Press with your finger against
    • something: you thus acquaint yourself with the simplest form of
    • just now, you realize the mass by weighing it. Mass makes its
    • exert pressure. You make acquaintance with pressure by pressing upon
    • something with your finger. Now we must ask ourselves: Is there
    • rather, don't! Try to exert pressure on some part of your body and
    • then go on making it ever more intense. What will happen? If you go
    • on long enough you will lose consciousness. You may conclude that the
    • place, so to speak, on a small scale when you exert a pressure that
    • is still bearable. Only in that case you lose, a little of the force
    • of consciousness that you can bear it. Nevertheless, what I have
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  • Title: Third Lecture (First Scientific Lecture-Course)
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    • — has after all proved difficult for some of you to understand.
    • Do not be troubled if this is so; you will understand it better by
    • You will realize that
    • the main idea of the present course is for me to tell you some of the
    • things which you will not find in the text-books, things not included
    • I really must ask you to swallow the bitter pill (I mean, those of
    • you who found things difficult to understand). Your difficulty lies
    • in the fact that you are always hankering after a phoronomical
    • terms of qualities as you are here, you may well be saying to
    • yourselves: Here we get stuck! You must attribute it to the unnatural
    • especially to Waldorf-School and other teachers — you will
    • yourselves to some extent still have to take the same direction with
    • your pupils. It will not be possible, all at once, to bring the
    • commonly held by physicists, so Goethe learned, that when you let
    • Here we have cut it out very neatly; you see a pretty fair circle.
    • the given facts. However, as you have seen, in these phenomena not
    • Suppose you put two
    • to get an image. You see then how the double prism treats the light.
    • wide space within which such pictures could be formed. But as you
    • the cylinder of light apart. If I may so express myself, you can read
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  • Title: Fourth Lecture (First Scientific Lecture-Course)
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    • placing before you what we may call the “Ur-phenomenon”
    • by, you will find it confirmed and reinforced in the phenomena you
    • Ur-phenomenon is not always easy to recognize at once. But if you
    • take the trouble you will find it everywhere. The simple phenomenon
    • Conversely, if you have here a simple black surface and look at it
    • directly, you will see it black, but if you interpose a trough of
    • water through which you send a stream of light so that the liquid is
    • illumined, you will be looking at the dark through something light.
    • Figure IVc). You will remember; if this is the prism and this the
    • What then do you see
    • in this case? Watch what you see, state it simply and then connect it
    • what you actually see will emerge in all detail. Only you must hold
    • to what is really seen. For if you are looking thus into the bright
    • you — you see something light, namely the cylinder of light
    • itself, but you are seeing it through dark. (That there is something
    • in effect — you look at something light, namely at the
    • cylinder-of-light coming towards you. Through what is dark you look
    • at what is light; here therefore you should be seeing yellow or
    • you do. Likewise the red colour below is proof that here is a region
    • over-whelms the dark. Thus as you look in this direction, however
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  • Title: Fifth Lecture (First Scientific Lecture-Course)
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    • of which we spoke last time. You will remember: when an incandescent
    • you will presently see, the elements we are compiling will pave the
    • We will now shew you,
    • the following experiment. You now see the complete spectrum projected
    • disulphide, this light is extinguished. You see the spectrum clearly
    • divided into two portions; the middle part is blotted out. You only
    • carbon disulphide — you see the complete spectrum divided into
    • two portions; you only see the two poles on either hand.
    • “phosphores”, If you come across the word
    • of that time, you need not take it to mean what is called
    • not the simplest. Another phenomenon is really the simple one. If you
    • oil appears slightly yellow. If on the other hand you place yourself
    • so as to let the light pass through the oil while you look at it from
    • interesting if you make a solution of plant green — chlorophyll
    • green. But if you take your stand to some extent behind it — if
    • you look from behind to where the light goes through — the
    • So you have two stages. The one is Fluorescence: we make a body
    • forming of ideas. There is another fundamental idea which you will
    • exactly of what I shall bring forward. Think as precisely as you can.
    • I will remind you again (as once before in these lectures) of the
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  • Title: Sixth Lecture (First Scientific Lecture-Course)
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    • saturated with the present way of thought that if you have been
    • through this kind of schooling it is extremely difficult for you to
    • find your way back to the pure facts. You must first cultivate the
    • in a too trivial meaning. You have to learn to sense the facts, and
    • VIa). Through it you look at a luminous object. As I am drawing
    • circle. Cast your mind back to what you learned in your school days.
    • What did they teach you of the phenomenon you see when you observe
    • the luminous object, — with your eye, say, here — looking
    • through the glass? You were no doubt told that rays of light proceed
    • Figure). Rays, you were told, proceed from the shining object. In
    • Simply by looking through the glass and comparing what you see with
    • what you saw before the plate of glass was there, you do indeed
    • find the direction in which the light will be refracted, you must
    • is said, you will remember, in tracing how the “ray of
    • the point of exit from the glass, you will have to erect the normal.
    • to do so (.... or is it to the soul, or to some demon that you
    • part is shifted too. But now, what is this “dark”? You
    • to it). You certainly will not deny that when you look at light the
    • that is all there is to it.” You see the fallacy at once in
    • this example, for you know very well that the effect of being
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  • Title: Seventh Lecture (First Scientific Lecture-Course)
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    • colour. As I have said before, all I can give you in this Course
    • did. In the last resort I wish to lead you to a certain kind of
    • insight into Science, and you must look on all that I bring forward
    • You have seen
    • darkness. Today I will begin by shewing you the phenomenon of
    • upright rod which will throw shadows on this screen. You see two
    • shadows, without perceptible colour. You only need to take a good
    • look at what is here before you, you will be bound to say: the
    • shadow you are seeing on the right is the one thrown by the
    • of the screen apart from the two bands of shadow, you will agree it
    • — that is, darkened to some extent. As a result, you will see
    • background does when you look sharply for example at a small red
    • surface for a time, then turn your eye away and look straight at
    • the white. You then see green where you formerly saw red, though
    • there is nothing there. You yourself, as it were, see the green
    • colour on to the white surface. In such a case, you are seeing the
    • green surface as an after-image in time of the red which you were
    • seeing just before, when you exposed your eye to the red surface
    • source of light to red, you see the shadow green. What was mere
    • darkness before, you now see green. And now I darken the same
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  • Title: Eighth Lecture (First Scientific Lecture-Course)
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    • speaking about sound and tone which you will find in the customary
    • century at the earliest. By such examples you will most readily
    • at some distance from you, you see the flash of light in the
    • distance and hear the report some time later, just as you hear the
    • thunder after you see the lightning. If you neglect that there is
    • such a thing as a velocity of light, you may then call the time
    • that elapses between your perception of the impression of light and
    • your perception of the sound, the time the sound has taken to go
    • the corresponding distance. So you can calculate how quickly the
    • — and you get something like a “velocity of propagation
    • among the first. If for example you twang a violin-string or the
    • this branch of Science. I have already drawn your attention to the
    • experiments; they are at hand, if I may say so. What you can get
    • we are now about to demonstrate. You see this disc with its rows of
    • to direct a stream of air on to the moving disc. (He did.) You can
    • before; it will then lead you to the following reflection. A single
    • ‘tone’. In all manner of variations you will find ever
    • flesh and bone, till such results emerge as you find quoted from
    • conclusion. What would become of it if I treated you, who are now
    • the outcome: You, all of you, now sitting here before me, — I
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  • Title: Ninth Lecture (First Scientific Lecture-Course)
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    • do during these days is to give you a few points of view, with the
    • explanations may be rounded off, to give you something more
    • draw your attention to the development of electrical discoveries,
    • beginning no doubt with things that are well-known to you from your
    • You know the
    • attract small bodies such as bits of paper. You know too what
    • brings negative toward itself in some way. You know the phenomenon
    • IXa). If you electrify a metal rod and impart the electricity
    • coating thereby becomes electrified negatively. Then, as you know,
    • you can connect the one coating, imbued with positive, and the
    • one another. You have to make connection so that the one
    • you have often witnessed the experiment.
    • strong enough. You see the leaves repelling one another just a
    • across the gap. Now you are also aware that this kind of
    • again, I am presumably still recalling what you already know
    • remind you of the main principles. Galvani observed the leg of a
    • You will remember how we demonstrated it the other day. By
    • as such. He found for instance that if you generate an electric
    • necessary tension, you can produce the following result. Suppose we
    • all, is a phenomenon not unlike what you would have if here for
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  • Title: Tenth Lecture (First Scientific Lecture-Course)
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    • provisional conclusion. I want to give you a few guiding lines
    • which may help you in developing such thoughts about Nature for
    • yourselves, taking your start from characteristic facts which you
    • presented to us by Nature. You will remember what I was trying to
    • element of matter. For you can imagine that a bombardment is taking
    • screen which you put in the way; the space behind the screen is
    • cathode rays impinge on it, and on the other side you will see
    • something like a shadow of the St. Andrew's cross, from which you
    • of a magnet. I beg you to observe it now. You will find the shadow
    • influenced by the magnetic field. You see then, just as I might
    • shew you, what was not possible yesterday, the rays that issue from
    • the other pole and that are called “canal rays”. You
    • shew you the kind of rays produced by this apparatus: they are
    • observe the glass. You see it shining with a very strong,
    • telling you how in the further study of these things it appeared
    • may become for you an essential way, not only into these phenomena
    • ether. This “ether” however, as you must see, proved a
    • tricky fellow. Whenever you are on the point of catching it, it
    • evades you. It will not answer the roll-call. In these experiments
    • You see, the
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