Mercury line - runs from the bottom of the palm near the wrist, up through the palm towards the little finger; purported to be an indicator of persistent health issues, business acumen, or skill in communication.

The line of mercury is the health line of the person. It is situated on the outer side of the palm underneath the fourth finger. The advantage of a missing line of health is that there is perfect digestion and functioning of the stomach which brings a clear head and abounding energy that are essential qualities for buisness dealings.
A straight line of health without any markings is desirable. This indicates that there will be goood health and practility of life