The Yogi teachings inform us that the lower planes of the Astral World are inhabited by souls of a very gross and degraded type, undeveloped and animal-like. These low souls live out the tendencies and characteristics of their former earth lives, and reincarnate rapidly in order to pursue their material attractions. Of course, there is slowly working even in these undeveloped souls an upward tendency, but it is so slow as to be almost imperceptible. In time these undeveloped souls grow sick and tired of their materiality, and then comes the chance for a slight advance. Of course these undeveloped souls have no access to the higher planes of the Astral world, but are confined to their own degraded plane and to the sub-planes which separate the Astral World from the material world. They cling as closely as possible to the earthly scenes, and are separated from the material world by only a thin screen (if we may use the word). They suffer the tantalizing condition of being within sight and hearing of their old material scenes and environments, and yet unable to manifest on them. These souls form the low class of "spirits" of which we hear so much in certain circles. They hang around their old scenes of debauchery and sense gratification, and often are able to influence the minds of living persons along the same line and plane of development. For instance, these creatures hover around low saloons and places of ill-repute, influencing the sodden brains of living persons to participate in the illicit gratifications of the lower sensual nature.