Architectural History can only be understood by the eye, either by seeing the buildings themselves, with time to examine the construction and the details of each period, or by accurate representations of them arranged in chronological order. This is what has been attempted in the present work; and when so arranged, any one, however ignorant of the subject, can see and understand the gradual progress and change from one generation to another. What is thus understood is also easily remembered; we can always remember what we have seen, much better than what we have only heard or read about; an accurate representation of each object is better than many pages of description, or of essays about it. The arrangement made in this little work will enable any one to understand the general principles of what are called the styles or periods of Gothic Architecture.