An oblique, rectilinear forehead is ardent and vigorous.
Arched foreheads appear properly to be feminine.
A forehead neither too perpendicular nor too retreating, but a happy mean, indicates the post-perfect character of wisdom.
I might also state it as an axiom that straight lines considered as such, and curves considered as such, are related as power and weakness, obstinacy and flexibility, understanding and sensation.
I have seen no man with sharp, projecting eyebones who was not inclined to vigorous thinking and wise planning.
Yet, even lacking sharpness, a head may be excellent if the forehead sink like a perpendicular wall upon horizontal eyebrows, and be greatly rounded towards the temples.
Perpendicular foreheads, projecting so as not to rest immediately upon the nose, and small, wrinkled, short, and shining, indicate little imagination, little understanding, little sensation.
Foreheads with many angular, knotty protuberances denote perseverance and much vigorous, firm, harsh, oppressive, ardent activity.
It is a sure sign of a clear, sound understanding and a good temperament when the profile of the forehead has two proportionate arches, the lower of which projects.
Eyebones with well-marked, firm arches I never saw but in noble and great men.