Techinically I would rate this 4.5 stars, but rounded up ;) I found this book to be fascinating and my only complaint is that it left me wanting to know more.
Typically when I get a reference book I end up reading the interesting parts and skipping the boring ones. I read this book from cover to cover in the first days I had it. The chemical composition chapter could be daunting to some, but I found it very interesting and it makes it easier to see how certain oils relate to others. I like how the book flowed, it was like an ever broadening introduction of information. I also appreciated that this is a book made for massage therapists who want to incorporate aromatherapy, and this anthem was repeated throughout the book. Some techniques that massage therapists wouldn't utilize, ex. ingestion of oils, was briefly described but only to further understanding of the broad scope of aromatherapy and it was made clear that a massage therapist would not practice these techniques.
I like that the individual oils were detailed in the middle of the book vs beginning or end. Also very helpful was the tip on learning the scientific names of the oils. There are so many types of lavender, I formerly assumed there to be only one kind. Now I can look for scientific names and know 2 things; what I'm really getting, and if this is not included with the oil that the dealer may not be one I want to buy from.
The only thing I would have liked to have seen more of in the book is perhaps some blending recipes. Techniques on blending the oils is discussed, but I would have liked a few more ideas to experiment with even if they were simply guidelines.
Overall, I'm very happy with this book and have not found anything compareable on the market for massage therapists wishing to utilize aromatherapy.