"A directive is a small sample, or token, of what you are going to search for: a little bottle of water for instance, a chip of whatever mineral, a sample coin or artifact, a few leaves if you seek a particular plant, or, no matter what may be your quest, its name in bold lettering on a piece of card. These are only a few examples of possible directive; there is no end to their variety, and dowsers exercise great ingenuity sometimes in devising tokens to represent successfully something of which no sample can be had."