As for recognition based on the small or large size of the head, you should know that the reason for the small size of the head is the scarcity of matter during its creation, and the reason for its large size is the abundance of matter; I mean the matter of the seed allocated to the head in the natural distribution. Further, if, with the poverty of matter, the power of the original formative force is present, then the shape of the head is beautiful, and this is not as ugly as a small head of an ugly form from birth, indicating the weakness of the formative force. But at the same time, a small head is not without deformity in relation to the shape of the brain; his abilities are weak, and there is little scope for rational and natural forces. That is why face readers so decisively assert that such and such a person is grumpy, cowardly, angry, and indecisive in business. Galen also says that the small size of the head necessarily indicates an ugly shape of the brain.
And yet, large head sizes do not always indicate a good state of the brain, if they are not combined with its beautiful shape, with a thick neck and broad chest. Such qualities are a consequence of the large size of the spine and ribs, due to the significant size and strength of the spinal cord, which in turn depends on the strength of the brain. If the power of the formative force is combined with the abundance of matter, then the head has the appropriate shape. This is confirmed, by the way, by the existence of a correspondence between the shape of the head and other organs. If a large head is accompanied by a weakness in the formative force, then the head has an ugly shape and is set on a weak neck and small spine, or what is around the head and grows on it is damaged. In addition, unnatural phenomena arise from excessive head size. In children, for example, the head sometimes swells and enlarges not naturally, but in a painful way; the reason for this is the abundance of boiling matter. The same thing happens in adults with painful headaches. Sometimes the crown becomes smaller and the temples become sunken if erysipelas rises to the brain.
So, you have now learned what small and large head sizes indicate. Among the signs of a good state of the brain is that it is not affected by the fumes of wine and other intoxicants, which we will describe along with it, and its rarefaction and warming properties act, so that the mind is sharpened