The work by Carvallo was entitled _Descripción histórico-geográfica del reino de Chile_. On account of the extensive investigations on which it is based and its independent spirit it may be properly classed with the writings of Pérez García. Both of these authors were, moreover, distinguished from many of their predecessors by their secular status. García was a merchant and Carvallo was a soldier. As a soldier Carvallo was subordinated to Ambrosio O’Higgins while that officer was in general command of the southern frontier, and afterwards when he had become governor and captain-general of Chile. The friendly relation that at first existed between them was later changed to hatred and hostility, by which O’Higgins was moved to use his influence to obstruct the execution of Carvallo’s plans. This is seen in the failure of Carvallo to obtain the office of corregidor in Peru for which he had applied, and also in the objections raised by O’Higgins to granting Carvallo leave to go to Santiago to consult authorities for his proposed history of Chile, as well as in his later refusal to grant his request for permission to go to Madrid to secure its publication. When Carvallo proposed to abandon his military career and enter a monastery, he requested that in his ecclesiastical position his military salary might continue to be paid to him. This O’Higgins firmly and definitely refused. But by persistence and a subsequent petition he succeeded in obtaining O’Higgins’ permission to go to Santiago; and directly from the government in Spain he obtained leave to go to Madrid. [Sidenote: Life of Carvallo] [Sidenote: Carvallo’s project to write a history]