I bought this book about 4 years ago and I am placing the review now as having bought many crystal books since , I find I return to this book most often.It has several excercises mentioned which I have used and they seem to be quite beneficial.
It is short, you can drop in when you want and take a section. A lovely introduction to Crystal healing. If you doubt that they work, then you may find that simply taking time out from the day job, the mortgage, the recession, pressures of examinations...and dropping by the ideas in this book may surprise you by simply shifting your thinking from the everyday. Enjoy