The Old City is written of progressive linear form, form that goes to the meeting of the concepts and hypotheses defended for the author. In the workmanship it has a clear progressive conception of history, the society human being is in a process of evolution and development. Thus the author initiates its explanation> of this evolution from the institutions Greeks and Romans, resultant institutions of the religious beliefs of these societies. The thesis of Fustel centers in the paper of the religious beliefs for the formation of the different types of social organization and institutions politics of a human group. From this conception a parallel is traced on the basis of enters the historical process of different societies a classification of the religious beliefs, that is, similar beliefs result in similar institutions and historical process. Although the workmanship to possess a great volume its language and forms didactics to display its reasoning becomes the easy and pleasant reading, therefore the Old City also is considered a literary composition. By having a great volume it was divided by the author in five books or parts, where each book of these if subdivides in small chapters.
For the headings of these books it can be perceived the linearity of the workmanship and the paper protagonist given to the religious beliefs and the family. the man is the product and the summary of all its 3 previous times If the laws of the association human being already are not the same ones of the ones of the antiquity, the reason are where something it proper man if transformed 4. For the reasons above informed Fustel de Coulanges attributes to significant importance to the constitutions and set of laws. Beyond using workmanships of authors of the time as source, the laws and the proper language are important ways to congregate information on a society, that is, they are also indispensable sources for the understanding of a society of determined historical context.