Opera intitulata Fontegara
A treatise about recorder playing, ornaments and passaggi.
The book gives rows and rows of ideas on how to ornament a certain interval: "when you go one step up, you could ornament it in these ways." It includes some very complicated patterns in difficult rhythmical values like quintuplets and septuplets.
This is the first instrumental tutor solely devoted to the recorder and this improvisation practice.
Starting off with a simple introduction on a scale:
Later on there are also tables with different types of trills, some including trills over the interval of a third or fourth!!
A translation can be found here (free):