walls tinted black and a narrow roof projecting within the walls. It should be 10 braccia wide and 20 braccia long and 10 braccia high and covered with a linen awning; or else paint a work towards evening or when it is cloudy or misty, and this is a perfect light.
On various helps in preparing a picture (521-530).
521.
To draw a nude figure from nature, or any thing else, hold in your hand a plumb-line to enable you to judge of the relative position of objects.
522.
OF DRAWING AN OBJECT.
When you draw take care to set up a principal line which you must observe all throughout the object you are drawing; every thing should bear relation to the direction of this principal line.
523.
OF A MODE OF DRAWING A PLACE ACCURATELY.
Have a piece of glass as large as a half sheet of royal folio paper and set