This section is from the book "The Laws Of Scientific Hand Reading", by William G. Benham. Also available from Amazon: The Laws of Scientific Hand Reading.
It also produces a narrow quadrangle, and consequently a secretive disposition. If the Heart line takes a precipitous depression and ends on the Mount of the Moon (45), it makes the subject extremely jealous, for there will be too much Heart line, backed by the imagination of the Lunarian, which will magnify every act of one he loves into some form of unfaithfulness. This formation is a most unhappy one. This does not necessarily indicate a danger to life, for the Heart line may not cross the Head line. If the Heart line forms a curve and ends on the Plain of Mars (46), it will be a serious menace, for it will cut the Head line squarely, will pour its Current into the Plain of Mars (the seat of temper and excitability), and will consequently endanger life by cutting the Head line, and will also show the subject to be exceedingly irritable, changeable in affections, constantly seeking excitement, and hard to get along with. Carefully note the Life, Head, and Mercury lines if this indication is seen, to determine whether the outcome is serious. Bad defects in these lines at the age at which the Head line is cut would confirm this reading.
Be careful not to confuse this marking with a Saturn line rising in the Plain of Mars. If the line goes well up into Jupiter, read it as the Heart line; if it goes into Saturn, or only to the edge of Jupiter, read it as a Saturn line with the Heart line absent. If the line curves around and ends on the Mount of Venus (47), it is a serious indication, for it cuts both the lines of Head and Life. In this rare marking, note carefully the condition of lines where the cutting takes place, and the condition of Head and Life lines afterwards. If defects appear in either, you know damage has been done to the head and that life is in danger. If the Life line ends or fades away soon after, you know that the life terminates.

No. 45.

No. 46.

No. 47.
It is not my intention to give every possible variation of the Heart line here, but it is my desire to indicate constantly the general principles governing it, and the methods of reasoning out its combinations, which will start you in the way of using your own reasoning faculties rather than of memorizing a set of illustrations. It is to teach the way and habit of reasoning that I aspire, and this is the only kind of work that possesses any value. When you have acquired the habit and way of thinking combinations out, you can throw books away.
The character of the Heart line, which we will next consider, is most important, and must be carefully noted, not in its entirety, as 1 have said before, but bit by bit from source to ending place. The perfect line is one which is deep cut and smooth, is not broken, islanded, or defective in other ways, is well colored, and of proper length. Such a line indicates a good physical condition of the heart, good circulation, strong affections constant and smooth in operation, one reliable in love matters, but not frivolous nor sentimental. These subjects are brave, courageous, and fearless. Such persons love ardently and remain constant, but they do not make a display of their feelings, neither do they enjoy great demonstrations from others. They are consequently sometimes thought cold and distant. This is incorrect; they love devotedly and constantly, but they do not " wear the heart on the sleeve." With deep Heart lines there is little fear of heart disease from a weak condition of the organ itself, and there is little use to look for health defects of the line. With this Heart line the subject will have fewer love affairs, but what he has will be strong.
He will have confidence in those he loves, and a disappointment will affect him severely, for, while quiet and undemonstrative, the Current runs deeply. Such subjects do not pick up any and everyone and make a great demonstration over them, but they love their dear ones and friends with a steady devotedness. With such a clear line there is the best kind of a channel for the Current to run through, no obstructions, and, consequently, the best kind of heart action and the strongest and most reliable affections.
If the line is small and thin, the person has little care for others, is narrow-minded, cowardly, timid, unsympathetic, and has no real affection for anyone. All display of love which he might make is from a desire to further selfish ends.
Do not make the mistake of calling a Heart line thin and giving it the above reading unless it is thin, while the other lines are well marked, in which case it has its full meaning and puts the heart out of proportion to the rest of the lines. With all kinds of Heart lines, apply them to the type of the subject. A Jupiterian and Venusian will be expected to have the best kind of Heart lines. The Apollonian may have his health defect, heart disease, show on the line, but will have outside of this a good line and strong affections. The Martian will be expected to have a good Heart line, but it may be excessive in strength. A good specimen of the Mercurian type will have a good Heart line, but a bad specimen will have the thin line showing the selfish disregard for others and the furthering of selfish ends. The Saturnian, if good, will have a good line, if bad, a thin line. The Lunarian, naturally cold and selfish, will be expected to have a thin or chained, shallow white line. If you should find the thin line on a subject belonging to a type on which it is abnormal, read the line properly, but do not give it alt the force you would on a type where it is expected.
For example, the thin line found on a Venusian will not be read so strongly as the same line on a Lunarian.
 
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