In MINDSPACE AND TIMESTREAM book the author relates his distillation of almost five decades of research, psychotherapy, shamanic and yogic practices, as well as teaching experience, on the role of changing states of consciousness in psychological health and spiritual growth. Each state of consciousness that we experience, ranging from the familiar states of waking, sleeping, dreaming and meditating, to the expansive spiritual states of psychedelic explorers, mystics and mediums, has its own distinctly different mind-space and time-stream. We need to learn how to use the expansive, positive states for spiritual growth and creative expression and navigate out of the contractive, unhealthy states of fear and rage, addictions and compulsions, into healthier, life-affirming states. This book is the fourth in a new series on The Ecology of Consciousness. Already published are Vol. 1, The Expansion of Consciousness; Vol. 2, The Roots of War and Domination; and Vol. 3, Alchemical Divination, all available from Regent Press. Ralph Metzner, Ph.D. is a recognized pioneer in studies of consciousness and its transformations. He is a psychotherapist and Professor Emeritus at the California Institute of Integral Studies, where he was also the Academic Dean for ten years in the 1980s. He collaborated with Timothy Leary and Richard Alpert in the studies of psychedelic drugs at Harvard in the 1960s, and co-authored The Psychedelic Experience. His books include Maps of Consciousness, The Well of Remembrance, The Unfolding Self and Green Psychology.