As the power increases, and the conditions become stabilized and perfected, the manifestations will become more pronounced. It often happens that cloudy nebulous bodies of psychic substance are formed and float around in front of the cabinet, like clouds of steam or vapor illumined by a dim phosphorescent light. Sometimes attempts will seem to have been made to form these clouds into the semblance of the human body, and often these bodies are more or less incomplete, as for instance the arms may be missing, or else there may be dark holes where the eyes, nose, and mouth should be. It may be stated here that the sitters should not be frightened by these sights, nor should mental agitation be permitted to manifest too strongly, as such conditions act to retard further developments. Sometimes perfect hands and arms materialize, but apparently not attached to a body. These hands may float out over the circle, and may touch the members thereof. In rare cases these hands take articles handed them by members of the circle, which articles are then "dematerialized" and vanish from sight, afterward appearing in other parts of the house. Large articles of furniture have been known to be dematerialized in this way. Materialized Spirit Forms. Later on, the nebulous spirit forms will take on more definite lines and form, and will become more plainly visible, and will also assume a far more "solid" appearance. When the phenomena reaches its highest phases, the materialized spirit forms can be plainly seen and actually recognized by their friends in earth life. In some cases they will actually leave the front of the curtain and will walk down among the sitters, shaking hands with them, touching them on the cheek, or even embracing some loved one. In rare cases these materialized forms are able to converse with the sitters in the circle, just as plainly as when in earth life. Scientific Proof of Materialization. It is not the purpose of this book to prove the existence of mediumistic phenomena--rather it points out the means and methods whereby the student may obtain such proof for himself or herself. But it may be suggested here that the sceptic may find an abundance of proof of the genuineness of materialization phenomena in the records and reports made by eminent scientists, statesmen, and others. Particularly, the report of Sir William Crookes, the eminent English scientist, will furnish such proof to the inquirer who demands "scientific proof" before he will believe anything out of the usual. Sir William Crookes has given convincing evidence of the genuineness of spirit materialization, even going so far to offer records of the weight of materialized spirits, and their photographs taken by him--in some instances the photographs showing the forms of both medium and spirit materialization. How to Conduct a Materializing Seance.