Thanks for the information. You seem to have a better source for EOís than I do. I can get 1 gm, thatís about 22 drops of rose oil for $16.40, which is more to my budget. The EOís that I use in making my medicinal formulas are peppermint, olive, wintergreen, jojoba, tea tree, and so forth. These are much less expensive. Some of them I buy in the 4 oz size, and some in much larger sizes. But the cost is nothing like rose oil. The book sounds like good reading. Thanks.