EVIL EYE, a power which, according to an old and widespread superstition, resides in some people of doing injury to others by a mere look, or a look accompanied by certain words or charms. This belief, common amongst the ancients, is still prevalent among the more ignorant classes in Italy, Russia, Andalusia, the Highlands of Scotland, and other places. The Finns, Lapps, and Scandinavians, the Arabs and the Turks are all firm believers in the evil eye.
EV´OLUTE. The evolute of a curve is the curve which is the envelope of all its normals or the locus of all its centres of curvature. The first curve is called the involute of the second. These names are given to the curves because the end of a stretched thread unwound from the evolute will describe the involute.
EVOLUTION, a term introduced into biological writings in the early part of the eighteenth century to denote the mode of generation of living things. At first it was used in the same sense as we now apply the word development, more especially with reference to the process whereby the germ of an animal or plant becomes transformed into the adult organism; but it is now used in biology for the process by which more complex plants or animals have been derived from a series of less specialized ancestors by transformation. In accordance with the teaching of modern biology, all living creatures are the progeny of one original group of microscopic unicellular organisms, different branches of which during many millions of years have become diversely modified in structure and function to form the vast multitudes of diverse species of plants and animals with which we are acquainted.
The idea of a transformation of one type of being into another is extremely ancient, and its origin was in all probability genetically related to the primitive conceptions which have survived to the present day in totemism (q.v.) and such myths as the story of the were wolf. For once it was believed that a totem-animal, like a cow or a pig, could give birth to human beings, or that the Great Mother could at will assume a great variety of living forms, ranging from a mollusc or a grain of barley to a higher mammal, it was a comparatively simple step to arrange these potential 'ancestors' in a series, and provide mankind with a mythical genealogy. It is possible that such beliefs may have suggested to the Greek philosophers, such as Aristotle, speculations as to the process by which custom and change of habit might modify the structure of animals. But it was not until the end of the seventeenth century that the trend of philosophical speculation, associated with the growing understanding of natural processes, started lines of investigation which, after many failures, eventually brought forth Charles Darwin's _Origin of Species_ in 1859, and established once for all the fact that different species of animals and plants have been produced by the differentiation of the progeny of the same ultimate ancestors. The history of these events was admirably summarized by Huxley in 1878 in an article _Evolution in Biology_, republished in _Darwiniana_ (1893, p. 187); in this account due credit is given to the pioneers of the eighteenth and early nineteenth centuries, such as Lamarck, and to Darwin's co-discoverer of the hypothesis of natural selection, Alfred Russell Wallace.