De noxiis paludum effluviis, eorumque remediis.

Lancisi suggested that since malaria disappears after drainage it was due to some sort of poison emanating from marshes and possibly transmitted by mosquitoes. He planned a drainage scheme for marshy regions. His work included an early effort at medical cartography-- a map of the area between the gulfs of Astura and Terracina, south-southeast from Rome which identified twenty-six forested quarters ("quarti delle selve") and four ruined lands ("terre dirute").  The map also included directions of the major winds. Digital facsimile from the Internet Archive at this link.