[2] Sixteen years after the appearance of the Farbenlehre, Dr. Johannes Müller devoted a portion of his work, "Zur vergleichenden Physiologie des Gesichtssinnes des Menschen und der Thiere," to the critical examination of Goethe's theory. In his introductory remarks he expresses himself as follows—"For my own part I readily acknowledge that I have been greatly indebted to Goethe's treatise, and can truly say that without having studied it for some years in connexion with the actual phenomena, the present work would hardly have been undertaken. I have no hesitation in confessing more particularly that I have full faith in Goethe's statements, where they are merely descriptive of the phenomena, and where the author does not enter into explanations involving a decision on the great points of controversy." The names of Hegel, Schelling, Seebeck, Steffens, may also be mentioned, and many others might be added, as authorities more or less favourable to the Farbenlehre.
[3] "When Newton attempted to reckon up the rays of light decomposed by the prism," says Sir John Leslie, "and ventured to assign the famous number seven, he was apparently influenced by some lurking disposition towards mysticism. If any unprejudiced person will fairly repeat the experiment, he must soon be convinced that the various coloured spaces which paint the spectrum slide into each other by indefinite shadings: he may name four or five principal colours, but the subordinate spaces are evidently so multiplied as to be incapable of enumeration. The same illustrious mathematician, we can hardly doubt, was betrayed by a passion for analogy, when he imagined that the primary colours are distributed over the spectrum after the proportions of the diatonic scale of music, since those intermediate spaces have really no precise and defined limits."—Treatises on Various Subjects of Natural and Chemical Philosophy, p. 59.
[PREFACE TO THE FIRST EDITION OF 1810.]
It may naturally be asked whether, in proposing to treat of colours, light itself should not first engage our attention: to this we briefly and frankly answer that since so much has already been said on the subject of light, it can hardly be desirable to multiply repetitions by again going over the same ground.
Indeed, strictly speaking, it is useless to attempt to express the nature of a thing abstractedly. Effects we can perceive, and a complete history of those effects would, in fact, sufficiently define the nature of the thing itself. We should try in vain to describe a man's character, but let his acts be collected and an idea of the character will be presented to us.
The colours are acts of light; its active and passive modifications: thus considered we may expect from them some explanation respecting light itself. Colours and light, it is true, stand in the most intimate relation to each other, but we should think of both as belonging to nature as a whole, for it is nature as a whole which manifests itself by their means in an especial manner to the sense of sight.
The completeness of nature displays itself to another sense in a similar way. Let the eye be closed, let the sense of hearing be excited, and from the lightest breath to the wildest din, from the simplest sound to the highest harmony, from the most vehement and impassioned cry to the gentlest word of reason, still it is Nature that speaks and manifests her presence, her power, her pervading life and the vastness of her relations; so that a blind man to whom the infinite visible is denied, can still comprehend an infinite vitality by means of another organ.
And thus as we descend the scale of being, Nature speaks to other senses—to known, misunderstood, and unknown senses: so speaks she with herself and to us in a thousand modes. To the attentive observer she is nowhere dead nor silent; she has even a secret agent in inflexible matter, in a metal, the smallest portions of which tell us what is passing in the entire mass. However manifold, complicated, and unintelligible this language may often seem to us, yet its elements remain ever the same. With light poise and counterpoise, Nature oscillates within her prescribed limits, yet thus arise all the varieties and conditions of the phenomena which are presented to us in space and time.