ON DRAWING.
EXAMPLE
To draw the two objects seen here, distinguish them into different parts. One will first sketch the small one, and then the large one. With your charcoal stick, draw a line at the top marked 1, another at the middle marked 2, and another at the base marked 3. You will then see if the figure can fit within the intended space. Next, proceed to mark the smallest portions to the end, and this way you will manage to draw the figure. It is easy to see from this detail that Geometry is of absolute necessity here, and without it, nothing can be accurately drawn on the paper.
Translation Notes: The term 'Charbon de bois' refers directly to 'charcoal stick', a tool familiar to artists for sketching.