But the contrivances by which this process of fertilization is secured are so marvellous, that I confess I am completely staggered by the idea that these contrivances have been caused by the self-growth and adaptation of the plant without guidance. There is a plant called Salvia glutinosa[[21]]—easily recognized by its sticky calyx and pale yellow flowers. The anthers that bear the pollen are hidden far back in the hood of the flower, so that the pollen can neither fall nor can the wind carry it away; but the two anthers are supported on a sort of spring, and directly a bee goes to the flower and pushes in his head to get the honey, the spring is depressed and both anthers start forward, of course depositing their pollen on the hairy back of the bee, which carries it to the stigma of the next flower. This process can be tested without waiting for a bee, by pushing a bit of stick into the flower, when the curious action described will be observed. It is very easy to say that this admirable mechanical contrivance is of great use to the plant in its complete form; but try and imagine what use an intermediate form would have been! If development at once proceeded to the complete form, surely this marks design; if not, no partial step towards it would have been of any use, and therefore would not have been inherited and perpetuated so as to prepare for further completion. But many other plants have a structure so marvellous that this objection is continually applicable. Let me only recall one other case, that of the orchid, called Coryanthes macrantha. In this flower there are two little horns, which secrete a pure water, or rather water mixed with honey. The lower part of the flower consists of a long lip, the end of which is bent into the form of a bucket hanging below the horns. This bucket catches the nectar as it drops, and is furnished with a spout over which the liquid trickles when it is too full. But the mouth of the bucket is guarded by a curiously ridged cover with two openings, one on each side. The most ingenious man, says Mr. Darwin, would never by himself make out what this elaborate arrangement was intended for. It was at last discovered. Large humble bees were seen visiting the flower; by way of getting at the honey, they set to work to gnaw off the ridges of the lid above alluded to; in doing this they pushed one another into the bucket, and had to crawl out by the spout. As they passed out by this narrow aperture, they had to rub against the anthers and so carried off the pollen. When a bee so charged gets into another bucket, or into the same bucket a second time, and has to crawl out, he brushes against the stigma, and leaves the pollen on it. I might well have adduced this plant as another instance of the first objection, since it may well be asked, How could such a development, resulting in a structure which presents the greatest difficulty in the way of fertilization, be beneficial to the plant? But here the point is that, even if any one could assert the utility of such an elaborate and complicated development, and suppose it self-caused by accident or effect of environment, it certainly goes against the idea that all forms are due to an accumulation of small changes. For these curious contrivances in the case of Salvia, Coryanthes, and other plants, would in any case have been no use to the plant till the whole machinery was complete. Now, on the theory of slow changes gradually accumulating till the complete result was attained, there must have been generation after generation of plants, in which the machinery was as yet imperfect and only partly built up. But in such incomplete stages, fertilization would have been impossible, and therefore the plant must have died out. Just the same with the curious fly-trap in Dionoea. Whatever may be its benefit to the plant, till the whole apparatus as it now is, was complete, it would have been of no use. In the animal kingdom also, instances might be given: the giraffe has a long neck which is an advantage in getting food that other animals cannot reach; but what would have been the use of a neck which was becoming—and had not yet become—long? here intermediate stages would not have been useful, and therefore could not have been preserved.[[22]] In flat fishes it is curious that, though they are born with eyes on different sides of the head, the lower eye gradually grows round to the upper-side. As remarked by Mr. Mivart, natural selection could not have produced this change, since the first steps towards it could have been of no possible use, and could not therefore have occurred, at least not without direction and guidance from without. Mr. Darwin's explanation of the case does not touch this difficulty.
(3) The third point, the occurrence of so much beauty in organic life, is perhaps one of the most conclusive arguments for design in nature.
Here, if possible, more clearly than elsewhere, I see a total failure of "natural causes." We are told that the beauty of birds (for instance) is easily accounted for by the fact, that the ornamented and beautiful males are preferred by the other sex; and that this is an advantage, so the beauty has been perpetuated; and the same with butterflies and beetles.
We are told also that bright-coloured fruits attract birds, who eat the soft parts of the fruit and swallow the hard stone or seed which is thus prepared for germination, and carried about and dispersed over the earth's surface. Again, showy coloured flowers attract insects, which carry away pollen and fertilize other flowers.
All this is perfectly true; but it entirely fails to go far enough to meet the difficulty.
Now passing over such difficulties as the fact that bright colours in flowers do not attract insects in many cases, but much more inconspicuous flowers if they have a scent (mignonette, for example) do; passing over such a fact as that afforded by the violet, which (as some may not be aware) has two kinds of flower, one scented and of a beautiful colour, the other green and inconspicuous, and it is the latter, not the former which is usually fertile;—passing over all detailed difficulties of this kind, I allude only to the one great one, that in all these cases, besides mere bright colour, conspicuousness or showiness, there is a great and wonderful beauty of pattern, design, or colour arrangement, in nature. Now there is not a particle of evidence to show that any animal has, to the smallest extent, a sense of beauty. On the contrary it is most improbable. The sense of artistic beauty is not only peculiar to man, but only exists in him when civilized and cultivated. Uneducated people among ourselves have no sense of landscape and other beauty. How then can it exist in animals?
If there was nothing to explain but a uniform bright and showy colour, natural selection might be sufficient to account for it. How is it, then, that this is not the case? We have not only colour, but colour diversified in the most elaborate and charming manner. Look at the exquisite patterns on a butterfly's wing! look at the various delicate arrangements of colour and pattern in flowers; or look again at the arrangement of colour on a humming-bird—sometimes the tail, sometimes the breast is ornamented, sometimes a splendid crest covers the head, sometimes a jewelled gorget or ruff surrounds the throat; and these are not uniformly coloured, but exhibit metallic and other changes of lustre not to be imitated by the highest art. But to fully realize this, I had best refer to a more familiar instance. Let any one examine—as an object very easily procurable in these days—a peacock's feather. No doubt the whole tail when expanded is very brilliant; but look closely at the structure of a single feather; is all this arrangement needed only to make the tail bright or conspicuous? Observe how wonderfully the outer parts are varied; part has a metallic lustre of copper, part has this also shot with green: then there is a delicate ring of violet with a double yellowish border, all quite distinct from the inmost gorgeous "eye" of green, blue, and black, and all arranged on the same feather!
Take, again, the so-called diamond beetle of Brazil; here the wing case is black studded all over with little pits or specks, which as a whole only give it a powdery pale-green colour; but place it in the sunlight and look at it with a magnifying glass—each little speck is seen to be furnished with a set of minute metallic scales showing green and red flashes like so many diamonds. How does such a delicate ornament answer the demands of mere conspicuousness?
But there is a stronger case than this. I before alluded to the exquisite symmetry of the silicious and crystalline coverings of some of the simplest forms of marine animalcules; and also I may here add the beautiful colouring of shells sometimes on the inside.[[23]] In what possible way would this beauty serve for any purely useful purpose?
Lastly, how are we to account for the beauty of autumnal tints in woods, or coloured leaves in plants such as the Caladium? The beauty is of no conceivable use to the plant.