This section is from the book "The Practice Of Palmistry For Professional Purposes", by C. de Saint-Germain. Also available from Amazon: The Practice of Palmistry for Professional Purposes.
The Palm Proper extends only from the base of the Mounts to the third angle of the Triangle, and from the Line of Life to a normally placed Line of Liver, not including any Mounts. It is also called the Plain of Mars, and includes both the Quadrangle and the Triangle.
A. Flat but high [i. e., on a level with the Mounts under the fingers) - Great, sometimes indomitable, pride; egotism; often violent nature,
B. Flat but low - Timidity; insignificance of life and aims; sometimes cowardice.
C. Hollow - Moderately so. it has no special meaning and does not interfere: with the other indications,
D. Very hollow:
(l). More so toward the Line of Life - Domestic troubles.
(2). More so toward the Line of Head - Brain trouble or apoplexy.
(3). More so toward the Line of Heart - Disappointment in love; heart weakness.
(4). Mote SO toward the Mount of the-Moon - Nervous or interral tronbles
(5). In General - Failure in life. Loss of money.
Be careful to distinguish between a really hollow palm and a normally shaped palm appearing hollow solely on account of the neighboring high Mounts; in this case the hollow has no importance, and the reading must bear upon the development of the Mounts.