"The work has been developed based on the study of a wide bibliography, to which is added the analysis of the matters in the National Archive of Chile, Ecclesiastical Archives and International Archives. Contextually, the subject is exposed with the due scientific support, observing in this point an adequate formal regime of quotations. In the conclusions, propositions and hypotheses are formulated that can be considered a contribution to the subject". Aldo Topasio Ferretti"For the research, the author has resorted to a multiplicity of sources, and his review of archives should be highlighted, which constitutes a singular fact in this kind of work. Without using the techniques of historiography, he has privileged the publicity of the sources, seeking to group in a single body both the doctrinal information, if I may say, that is, the one that explains the meaning of these contracts, and the contracts themselves, transcribing literally their passages from the parent records" Antonio Pedrals García de Cortazar.