The text in my book «La pratica della perspettiva di opera molto utile a pittori, a scultori & ad architetti » which is written by Daniel Matteo Alvise Barbaro is organised in one big column. The continuous block of text is only interrupted by the various illustrations, which can be found throughout the book. The headings are rather big and printed in a much larger and thicker font than the main text. They are also underlined with an illustration of the first letter of a new chapter.
The font is slightly curved and looks like a standard font used in the 16th century, at least to my font knowledge. In the text it’s size is rather small without big gaps or margins.
At the beginning of the book, the Illustrations are mostly simple drawings which should show the foundation for perspective drawings. They are also rather small and don’t use the complete page. Further through the book, the illustrations are getting more complicated, till they show hole buildings, heads, and other highly complicated geometrical objects.
The illustrations are more or less evenly distributed throughout the book. There size range goes from just a small drawing somewhere on the page to drawings which reach over a whole page. The illustrations aren’t numbered or referenced. But they are necessary to support the explanatory text, which takes up the most space in the book. There for the illustrations quite have some importance, because they give the reader a visual idea how the described things should work and look.
This book with its illustrations and amount of texts suggests an academic use, to learn and understand perspective drawing.