One of the most familiar instances of the production of clairvoyant phenomena by means of Psychometry is that illustrated in the above quotation, namely the production of the en rapport relation with distant scenes by means of the connecting link of some small object which had at some time in the past been located at that point. In such cases the psychometrist usually presses the small object up to his or her head, and then induces a passive, receptive psychical condition; then, sooner or later, the clairvoyant experiences a "sensation," or a "dream picture" of the scene in question. Often, once the picture of the scene is obtained, the clairvoyant may manifest more marked past-time clairvoyance, in the direction of running back over the history of the scene itself. The instance related in the above quotation is a case of this kind. Similar cases are frequently met with by the investigator along these lines, in which the clairvoyant is able to give the history of certain places in ancient Egypt, from the connecting link of a piece of mummy-cloth; or else to give a picture of certain events in antediluvian times, from the connecting link of a bit of fossil substance. The history of Psychometry is filled with remarkable instances of this kind. Bullets gathered from battlefields also serve very effectively as such psychometric connecting links. Old furniture, old pictures, and old jewelry also are common objects serving to produce wonderful phenomena of this kind. In fact, any physical object having past-time or far-distant space connections may be employed effectively in such experiments. Psychic Underground Exploration. Psychometry is frequently employed to describe underground or "mine" conditions existing at the present time at the particular place from which a particular piece of ore or mineral has been taken, which ore or mineral has been handed the psychometrist to be used as the connecting link. As many practical miners know from actual experience, many valuable coal, zinc, lead, silver and gold mines have been successfully located in this way. In such cases the psychometrist has been able to follow up the psychic "scent" given by the piece of mineral, and thus to describe the strata or veins of the mineral lying underground and unopened by the pick or drill. Psychic Detective Work.