1. A bossed surface is a surface which lyeth unequally betweene his bounds.
It is contrary unto a Plaine surface, as wee heard at the [4 e v].
2. A bossed surface is either a sphericall, or varium.
3. A sphericall surface is a bossed surface equally distant from the center of the space inclosed.
Therefore
4. It is made by the turning about of an halfe circumference the diameter standeth still. è 14 d xj.
As here if thou shalt conceive the space betweene the periphery and the diameter to be empty.