It is the time order. The material is presented according to the order of time. It is the simplest way of arranging the material.
For example:
Man has existed for about a million years. He has possessed writing for about 6000 years agriculture somewhat longer, but perhaps not much longer. Science as a dominant factor in determining the beliefs of educated men has existed for about 300 years;as a source of economic technique, for about 150 years. In this brief period it has proved itself an incredibly powerful revolutionary force. When one consider how recently it has risen to power, we find ourselves forced to believe that we are at a very beginning of its work in transforming human life. What its future effects will be is a matter of conjecture, but possibly on study of its effects hithertomay make the conjecture a little less hazardous.
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