If many of these islands are marked it generally foreshadows a still greater tendency to blindness and weakness of the sight.
Islands under the fourth finger, the Mount of Mercury (6, Plate IV.), and the extremity of the Head Line denote weakness of the brain in old age, and a highly nervous worrying disposition.

If very badly marked they denote that in the latter part of life the subject may be disposed to insanity proceeding from a worrying disposition, and often from the overstraining of the mental faculties.

It will thus be seen that every portion of this remarkable line may be divided into sections to obtain marvellous detail in making predictions for the future.
This line can further be divided, showing with considerable clearness the ages at which troubles or changes in the mentality may be expected.
Under the first finger the period of the life indicated is the first 21 years, the second period contains another section of the three 7's, and lasts until 42 years of age; the third period of 7's which will be found under the third finger indicates the section from 49 to 63, and the fourth section which takes in the remainder of the hand, under the fourth finger, stands for the period from 70 up to the end.
CHANGES IN THE LINE OF HEAD Another extremely interesting point in studying the Line of Head is to take notice of certain changes in its position, or lines either dropping or rising from it, which will also be found to give very remarkable information.

For example: if a sloping Line of Head at any point in its track seems to curve or slightly bend upwards (1-1, Plate V.), it indicates that about that period of the person's life some unusual strain will be forced upon him.

If this curved line is clearly marked and not interfered with by things that look like blotches in it, the person, although of a completely opposite turn of mind to the practical, will yet rise superior to the occasion, and for the time being will develop a practical or business-like way of looking at things which may even be the very reverse of the nature.
If, however, instead of the curve or bend a fine line is seen leaving the Head Line in an upward direction (2-2, Plate V.), that period will leave a definite mark on the subject's entire character for the remainder of his life.