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HOW TO USE THIS BOOK

The Encyclopedia of Essential Oils is divided into two parts:

 Part I is a general introduction to aromatics, showing their changing role throughout history, from the ritual part they played in ancient civilizations, through medieval alchemy, to their modern-day applications in aromatherapy, herbalism and perfumery.

 Part II is a systematic survey of over 160 essential oils shown in alphabetical order according to the common name of the plants from which they are derived. Detailed information on each oil includes its botanical origins, herbal/folk tradition, odour characteristics, principal constituents and safety data, as well as its home and commercial uses.

This book can be approached in several ways:

1. It can be employed as a concise reference guide to a wide range of aromatic plants and oils, in the same way as a traditional herbal.

2. It can be used a self-help manual, showing how to use aromatherapy oils at home for the treatment of common complaints and to promote well-being.

3. It can be read from cover to cover as a comprehensive textbook on essential oils, shown in all their different aspects.

1. When using the book as a reference guide to essential oils, the name of the plant or oil may be found in the Botanical Index at the back of the book, where it is listed under:

a) its common name: for example, frankincense;

b) its Latin or botanical term: Boswellia carteri;

c) its essential oil trade name: olibanum;

d) or by its folk names: gum thus.

Other varieties, such as Indian frankincense (Boswellia serrata), may be found in the Botanical Classification section under their common family name ‘Burseraceae’, along with related species such as elemi, linaloe, myrrh and opopanax. Less common essential oils, such as blackcurrant (which is used mainly by the food industry), do not appear in the main body of the book, but are included in the Botanical Classification section under their common family name, in this case ‘Grossulariaceae’.

2. When using the book as a self-help manual on aromatherapy, it is best to consult the Therapeutic Index at the end of the book, where common complaints are grouped according to different parts of the body:

  Skin Care

  Circulation, Muscles and Joints

  Respiratory System

  Digestive System

  Genito-urinary and Endocrine Systems

  Immune System

  Nervous System

If for example, we have been working long hours at a desk and have developed a painful cramp in our neck, we should turn to the section on Circulation, Muscles and Joints where we find the heading ‘Muscular Cramp and Stiffness’. Of the essential oils which are listed, those shown in italics are generally considered to be the most useful and/or readily available, in this case allspice, lavender, marjoram, rosemary and black pepper. The choice of which oil to use depends on what is to hand, and on assessing the quality of each oil by consulting their entry in Part II of the book. Special attention should be paid to the safety data on each oil: both allspice and black pepper are known to be skin irritants if used in high concentration; rosemary and marjoram should be avoided during pregnancy; rosemary should not be used by epileptics at all. On the basis of our assessment, we may choose to use lavender, marjoram and a little black pepper which would make an excellent blend. Some of the principles behind blending oils can be found in Chapter 5, Creative Blending.

The various methods of application are indicated by the letters M, massage; C, compress; B, bath etc. Turn to Chapter 4, How to Use Essential Oils at Home, where you will find instructions on how to make up a massage oil or compress, and how many drops of oil to use in a bath. Further information on how essential oils work in specific cases can be found in Chapter 3, The Body – Actions and Applications.

3. Used as a comprehensive textbook, The Encyclopedia of Essential Oils provides a wealth of information about the essential oils themselves in all their various aspects, including their perfumery and flavouring applications. It shows the development of aromatics through history and the relationship between essential oils and other herbal products. It defines different kinds of aromatic materials and their methods of extraction, giving up-to-date areas of production. In addition, it includes information on their chemistry, pharmacology and safety levels. The ‘Actions’ ascribed to each plant refer either to the properties of the whole herb, or to parts of it, or to the essential oil. Difficult technical terms, mainly of a botanical or medical nature, are explained in the General Glossary at the end of the book.

However, since the therapeutic guidelines presented in the text are aimed primarily at the lay person without medical qualifications, the section dealing with the aromatherapy application of essential oils at home is limited to the treatment of common complaints only: Although there is a great deal of research being carried out at present into the potential uses of essential oils in the treatment of diseases such as cancer, AIDS and psychological disorders, these discussions fall beyond the scope of this book. References to the medical and folk use of particular plants in herbal medicine and their actions are intended to provide background information only, and are not intended as a guide for self-treatment.

Part I AN INTRODUCTION TO AROMATICS

1. HISTORICAL ROOTS
Natural Plant Origins

When we peel an orange, walk through a rose garden or rub a sprig of lavender between our fingers, we are all aware of the special scent of that plant. But what exactly is it that we can smell? Generally speaking, it is essential oils which give spices and herbs their specific scent and flavour, flowers and fruit their perfume. The essential oil in the orange peel is not difficult to identify; it is found in such profusion that it actually squirts out when we peel it. The minute droplets of oil which are contained in tiny pockets or glandular cells in the outer peel are very volatile, that is, they easily evaporate, infusing the air with their characteristic aroma.

A Herbalist’s Garden; Le Jardin de Santé, 1539

But not all plants contain essential or volatile oils in such profusion. The aromatic content in the flowers of the rose is so very small that it takes one ton of petals to produce 300g of rose oil. It is not fully understood why some plants contain essential oils and others not. It is clear that the aromatic quality of the oils plays a role in the attraction or repulsion of certain insects or animals. It has also been suggested that they play an important part in the transpiration and life processes of the plant itself, and as a protection against disease. They have been described as the ‘hormone’ or ‘life-blood’ of a plant, due to their highly concentrated and essential nature.

Aromatic oils can be found in all the various parts of a plant, including the seeds, bark, root, leaves, flowers, wood, balsam and resin. The bitter orange tree, for example, yields orange oil from the fruit peel, petitgrain from the leaves and twigs, and neroli oil from the orange blossoms. The clove tree produces different types of essential oil from its buds, stalks and leaves, whereas the Scotch pine yields distinct oils from its needles, wood and resin. The wide range of aromatic materials obtained from natural sources and the art of their extraction and use has developed slowly over the course of time, but its origins reach back to the very heart of the earliest civilizations.