The regularity of habits which prevail in settled populations may also have its influence in the general physical development of the people. The nomads have certain qualities cultivated to excess, and others almost entirely unused. The animal instincts are naturally found highly developed amongst the Mongols. The sense of sight is very acute in them; they are sensitive to indications of changes of weather, and so with various other instincts which to these wandering tribes supply the wants of a more artificial life, and enable them to exist in a state of nature. Individuality is in a great measure lost among such people. The habits and education of each individual among them are identical. Their pursuits are all the same. The very same faculties, both physical and mental, are kept in exercise among the whole tribe, and that through many generations, so that they have become hereditary, and indelibly imprinted on the race. A Mongol who was not a good horseman would be as anomalous as one that was inhospitable. The uniformity of life among the members of these nomad tribes, while it keeps back many faculties, the exercise of which is necessary to the existence of civilised people, also renders the type of whole tribes constant, so that no one individual differs greatly in external features from another. In civilised communities, where the division of labour has become so indispensable as to be in itself one great criterion of civilisation, a variety of types are evolved even in a single lifetime. A tailor can never be mistaken for a blacksmith, nor a soldier for a sailor; but tribes whose habits compel each family to be independent, as it were, of all the rest of the world, whose wants are limited by the means of supplying them, and among whom different occupations are almost unknown, do necessarily present a remarkable uniformity. It would be unsound to generalise too freely, and there are of course the individual distinctions of physiognomy as well marked as among other races, but these differences are more limited in their scope. Some trades are known to the Mongols, such as felt-making, tanning and dressing skins, iron, copper, and silver work, saddle-making, &c. In more settled parts they also make harness, carts, and sledges; and printing from blocks, after the manner of the Chinese and Japanese, is also known among them. These arts are most cultivated among the Bouriats in Siberia, who, by their contact with the Russians, and from the nature of the country they inhabit, are thrown more in the way of artificial life than the desert tribes.