In the mid-1730s, he was assigned the task of writing an account of Baja California. This seems to have been, at least in part, to counter the setback to the missionaries' efforts and reputation caused by the
Pericú revolt on the southernmost part of the peninsula in 1734. The historian was given access to the missionaries' correspondence and reports, and he was able to exchange letters with them to acquire further information, which he did through the use of questionnaires. Venegas' 600-page manuscript,
Empresas Apostólicas, was completed in 1739. It was sent to Spain, but it languished there rather than seeing publication because it was too detailed with regard to military matters. Another Jesuit historian,
Andrés Marcos Burriel, extensively revised Venegas' manuscript in the 1750s, and it was finally published in 1757 as
Noticia de la California in three volumes at Madrid. This work by Venegas and Burriel was subsequently translated into English (1759), Dutch (1761–1762), French (1766–1767), and German (1769–1770), and it became the standard source for information about the early Californias. The original manuscript was published in a facsimile edition in 1979. Venegas was a prolific writer, also authoring biographical and theological treatises. Among his other works are a manual on how to administer the sacraments, the official ritual for the Mexican branch of the Catholic church (1731), a biography of
Juan María de Salvatierra (1754a, 1929) and a biography of
Juan Bautista Zappa (1754b). Many of these were edited extensively before publication due to Venegas' writing style, which was too verbose for his fellow Jesuits.
Books by Venegas: • 1731.
Manual de párrocos, para administrar los santos sacramentos, y exercer otras functiones ecclesiásticas conforme al ritual romano. J. D. de Hogal, Mexico. • 1754a.
El apóstol Mariano representado en la vida del V.P. Juan María de Salvatierra, de la Compañía de Jesús. Doña María de Rivera,
Mexico City. • 1754b.
Vida y virtudes del V.P. Juan Bautista Zappa de la Compañía de Jesús. Pablo Nadal, Barcelona. • 1757.
Noticia de la California, y de su conquista temporal, y espiritual hasta el tiempo presente. Viuda de M. Fernández, Madrid. Translations of
Noticia de la California: • 1759.
A Natural and Civil History of California. James Rivington and James Fletcher, London. • 1761–1762.
Natuurlyke en burgerlyke historie van California. Johannes Enschedé, Te Haerlem, Netherlands. • 1766–1767.
Histoire naturelle et civile de la Californie. Chez Durand, Paris. • 1769–1770.
Natürliche und bürgerliche Geschichte von Californien. Meyerschen Buchhandlung, Lemgo, Germany. == Further reading ==