of expression naturally responding to his state of feeling, there will flow from his pen a composition changing to the same degree that the aspects of his subject change.  He will thus without effort conform to what we have seen to be the laws of effect.  And while his work presents to the reader that variety needful to prevent continuous exertion of the same faculties, it will also answer to the description of all highly organized products, both of man and of nature:  it will be not a series of like parts simply placed in juxtaposition, but one whole made up of unlike parts that are mutually dependent.