Colonies are probably of rare occurrence in the zoological world. By such I mean the sudden peopling of a district by an animal new to that part of the country. An example of how this may occur is illustrated by the sporadic excursion into Europe of Pallas’ sand-grouse. It will be remembered that a few years ago large numbers of this Siberian bird made their appearance in Europe. Similar inroads are on record for past years.
Supposing the conditions were favourable, the sand-grouse might very well have established itself in one or more localities, and then formed colonies in the true sense of the term. Artificial colonies are being continually formed by man: witness the rabbits in Australia and the pheasant in England.
The dispersion of animals is caused by the favouring conditions of physical features, or by the carrying power of winds and currents. The isolation of animals is also similarly caused; winds and currents may be in such a direction as to prevent migration, and the physical features may be otherwise unfavourable to dispersion.
We now have to apply these general remarks to the province of art, and to see how far similar conclusions may be drawn.
The conclusions of the synthetical zoologist who studies the problems of zoogeography, as it is sometimes called, are entirely dependent upon the tedious labours of the analytical or systematic zoologist. General conclusions are worth nothing if the data upon which they are erected are untrustworthy; hence an accurate identification of the fauna of a country is an absolutely necessary precursor to any theorising upon its affinity.
This self-evident proposition equally applies to the geographical distribution of art-forms. It is first of all necessary to determine the exact nature of any given pattern or design. I have often called attention to the danger which there is in assuming that similarity is identity, the most instructive example of this being exhibited in the fret-pattern group and the allied scroll-patterns. Instances could be multiplied were it necessary. One of the main objects of the present volume is to emphasise this fact, and to demonstrate that the signification of a design, that is, what it really is, can only be ascertained by an exhaustive study of that particular region where it occurs or from whence it has been derived. Analysis must precede synthesis. This has not yet been attempted on a large enough scale, and so it is at present impossible to deduce wide generalisations.
Art is subject to two prime factors—(1) the solidarity of the human race, and (2) ethnic idiosyncrasy. It is the extreme difficulty in distinguishing between these two factors which complicates the comparative study of customs and beliefs.
To the second of these we owe, for example, the evolution of the various forms of fret and scroll pattern, and to the first of them their world-wide retention as patterns.
It is difficult to avoid the expectation that whatever artistic provinces may be defined in the future, they will ultimately prove to be related to racial divisions.