Things must be studied in their movement
That everything should be studied in its development and changing forms is the demand of the second rule of scientific method. This is a simple consequence of the first law. For we cannot form an adequate picture of things as they are unless we take notice of their continual change and development. We have an intimate understanding of a house or a road when we know how it is built, of a tree or plant when we understand its growth, of the weather if we know how it was yesterday and how it will be tomorrow. When we confine or narrow down our attention to the condition in which things are at...