Zaccolini's treatise has four parts that discuss different theories of painting. The treatise is most noted for Zaccolini's theories on optics and vision and there how they relate to painting.
Hohenheim, also known as Paraclesus, shortly discusses a controversial yet popular herb Guaiacum, known for its medicinal properties brought from the Americas to Europe. The guaiacum was believed to be useful in the disease syphillis by many…