On Chiromancy

...we call them: the others have three joints. We call the first the index or pointing finger; the third, the middle; the fourth, the ring finger; and the fifth and last, the pinky original: "auricularem," literally the ear-finger, as it was used to scratch the ear. Note, however, that beneath each of these fingers lies a "mount," each of which has been assigned its own name according to its various meanings in human life.

The mount of the thumb is called the Mount of Venus, whose symbol is this: ♀. The mount of the index finger holds the name of Jupiter with its own mark: ♃. To the middle finger, we ascribe the name of Saturn and this figure: ♄. We say the Mount of the Sun is situated beneath the ring finger The text says "indici" (index) here, but the context of palmistry and the previous list suggests the author likely meant the ring finger, or "annularem" with its written figure: ☉. The pinky finger possesses the Mount of Mercury with its figure: ☿.

It is also permitted to know that there are many lines in the hand itself. The first of these the restricted line we call the Restricted Line term: "restricta" (the rascette or wrist lines). These are the horizontal creases separating the palm from the forearm; we shall speak of it first. This is not because it is the most important in a person's life, but because it is the first at the connection of the hand and the arm. In this place, there are sometimes two or three lines, all of which we call the restricted line or lines.

Indeed, these lines signify the strength or weakness of human life, its length or brevity, and at what age a person will act more happily or unhappily. And what I say regarding good health and the prosperity of the body, you should understand the same regarding riches and the success of fortune—that is, concerning the goods of fortune, such as the abundance or lack of wealth. The name of this line (as we have said) is the Restricted Line or the Joint of the Hand, because the hand is formed at that very joint, extending from the roundness of the arm into a flat surface. Therefore, we have begun with it as the first principle, and we shall follow thereafter by speaking of the stronger and more principal lines.

of life or of the heart?

The second is the Line of Life or of the Heart, or the right trian... The text cuts off mid-word, likely referring to the "triangle" of the hand