A more intense impression of what these metamorphoses actually mean is achieved by altering our mode of contemplation in the following way. After repeated and careful observation of the different forms on either of the plates, we build up inwardly, as a memory picture, the shape of the first leaf, and then transform this mental image successively into the images of the ensuing forms until we reach the final stage. The same process can also be tried retrogressively, and so repeated forward and backward.

This is how Goethe studied the doing of the plant, and it is by this method that he discovered the spiritual principle of all plant life, and succeeded also in throwing a first light on the inner life-principle of animals.

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We chose the transformation of leaf forms into one another as the starting-point of our observations, because the principle of metamorphosis appears here in a most conspicuous manner. This principle, however, is not confined to this part of the plant's organism. In fact, all the different organs which the plant produces within its life cycle - foliage, calyx, corolla, organs of fertilization, fruit and seed - are metamorphoses of one and the same organ.

Man has long learnt to make use of this law of metamorphosis in the plant for what is called doubling the flower of a certain species. Such a flower crowds many additional petals within its original circle, and these petals are nothing but metamorphosed stamens; this, for instance, is the difference between the wild and the cultivated rose. The multitude of petals in the latter is obtained by the transformation of a number of the former's innumerable stamens. (Note the intermediate stages between the two, often found inside the flower of such plants.)

This falling back from the stage of an organ of fertilization to that of a petal shows that the plant is capable of regressive metamorphosis, and we may conclude from this that in the normal sequence the different organs are transformed from one another by way of progressive metamorphosis. It is evident that the regressive type occurs only as an abnormality, or as a result of artificial cultivation. Plants once brought into this condition frequently show a general state of unrest, so that other organs also are inclined to fall back to a lower level. Thus we may come across a rose, an outer petal of which appears in the form of a leaf of the calyx (sepal), or one of the sepals is found to have grown into an ordinary rose leaf.

We now extend our mental exercise to the plant's whole organism. By a similar mental effort as applied to the leaf-formations we strive to build up a complete plant. We start with the seed, from which we first imagine the cotyledons unfolding, letting this be followed by the gradual development of the entire green part of the plant, its stem and leaves, until the final leaves change into the sepals of the calyx. These again we turn into the petals of the flower, until via pistil and stamens the fruit and seed are formed.

By pursuing in this way the living doing of the plant from stage to stage we become aware of a significant rhythm in its total life cycle. This, when first discovered by Goethe, gave him the key to an understanding of nature's general procedure in building living organisms, and in maintaining life in them.

The plant clearly divides into three major parts: firstly, the one that extends from the cotyledons to the calyx, the green part of the plant, that is, where the life principle is most active; secondly, the one comprising the flower itself with the organs of fertilization, where the vitality of the plant gives way to other principles; and lastly, the fruit and seed, which are destined to be discharged from the mother organism. Each of these three contains two kinds of organs: first, organs with the tendency to grow into width-leaf, flower and fruit; second, organs which are outwardly smaller and simpler, but have the function of preparing the decisive leaps in the plant's development: these are the calyx, the stamens, etc., and the seed.

In this succession, Goethe recognized a certain rhythm of expansion and contraction, and he found that the plant passes through it three times during any one cycle of its life. In the foliage the plant expands, in the calyx it contracts; it expands again in the flower and contracts in the pistil and stamens; finally, it expands in the fruit and contracts in the seed.