From these considerations it will appear that where an industry is large and regular in character, it falls more readily and completely under the control of machinery, where it is small and irregular it conforms more slowly and partially to the new methods. Most of the extractive industries of agriculture, stock-raising, fishing, mining, hunting, are irregular by reason of the nature of their material and its subjection to influences, geological, chemical, climatic, and others which are but slightly under calculation or human control. The final processes by which commodities are adapted to the use of individual consumers necessarily partake of the irregularity or variety of human tastes and desires. We shall therefore find most regularity in the intermediate processes where the raw materials, having been extracted from nature, are being endowed with those qualities of shape, position, etc., which are required to enable them to satisfy human wants. The manufacturing stages where machinery finds fullest application are in nearly all cases intermediate stages of production. Even where machine-production seems directly to satisfy some human want, there are commonly some final processes required which involve individual skill. Almost all products which satisfy the desires of man pass through a large number of productive processes which may be classed as extractive, transport, manufacturing, and distributive. These are, of course, not in all cases clearly distinguishable. Mixed with the extractive processes of mining and wheat-raising are several processes of transport and manufacture: the various stages of manufacture may be broken by stages of transport: a final process of manipulation or manufacture may precede the final act of distribution, as in the sale of drugs to the consumer. But, generally speaking, these four kinds of productive processes mark four historic stages in the passage from raw material to finished commodity. The two middle stages of transport and manufacture have fallen far more fully under the control of steam-driven machinery than the others, and it is in the elaboration of older manufacturing and transport processes and the addition of new processes that we trace the largest effects of the evolution of modern industrial methods. The following list of the divisions under which workers engaged in the production of material wealth are classified for purposes of the census may serve to bring out more clearly this proportionate development of machinery. The figures appended give the numbers engaged in the several occupations in 1891, and serve to approximately indicate the relative importance of the several principal branches of industry:--