In ancient times the most important ceremonies were accompanied by the aroma of resins, woods, herbs, flowers and spices which were burnt like incense. In the Orient, temples are filled with rose petals to facilitate the opening of faithful hearts. These were not primitive rituals or superstitions: today it has be demonstrated that odours are capable of blocking or evoking memories better than images or melodies because they reach directly the part of the brain which houses the emotions. Natural perfumes directly influence mood, mental activity and behaviour and thanks to aromatherapy, which studies the therapeutic properties of essences, one can learn to use the perfume of plants and flowers to obtain the desired effects.