This book has adequate illustrations, and fairly easy to understand.
This book covers both the Physical (Wai Dan) and mental (Nei Dan) aspects of Chi Kung and includes adequate information on the primary meridians.
Vital points are special areas occuring on the meridians that can be stimulated via massage or accupuncture.
The small universe is where the practitioner directs chi through the conception, and governing meridians.
The big universe is where the chi kung practitioner directs chi through t! he 12 primary meridians.