A third contribution is to be found in the large store of æsthetic objects provided by science. Many of its theories are objects of surpassing beauty. This is particularly true of the mathematical sciences--indeed, there are a number of mathematicians who have felt impelled to write of their science in a kind of prose-poetry--but it is almost equally true of such a science as Geology. We can contemplate schemes which, in their own way, are as all-embracing as that of the _Divina Commedia_, and it does not detract from their æsthetic charm to know that they are also true. The processes by which the theories are obtained are often as æsthetically important as the theories themselves. A subtle, elaborate and economical piece of reasoning often affords great æsthetic pleasure, none the less real because comparatively few people enjoy it. The fact that the history of a big scientific investigation, such as the Electromagnetic Theory or Einstein’s Theory of Relativity, is not generally regarded as a poem is due merely to an accident of language and education. But we have to admit that most people are affected by these accidents, and that the æsthetic objects provided by science count almost as few admirers as do the “beauties” of chess. If we may judge from the number of popular books and articles dealing with science, there is some hope, however, that this particular contribution is receiving more attention. The results of such increased attention will not be simple, but if it did no more than add fresh æsthetic objects, the contribution would be important.