Life force is one of the central concepts in magic, but it is usually used only associatively and, while filled with many feelings, is rarely really defined precisely.
In this book, the life force is examined in detail and described in terms of what it could be - and also what it cannot be.
There are many questions about this subject - and trying to answer them leads to much sharper contours of the life force. Some of these research questions are:

Is the life force a force or a substance?
Where is the life force actually located?
What is its relationship to consciousness and matter?
What is its relationship to analogies?
What do we see in clairvoyance?
Why is there no independent life-force perception - something like seeing by the eye, hearing by the ear, smelling by the nose?
Why does the life force organize itself in the structure of the chakra system? And why is there the same structure in a solar system?