Thermodynamically constrained averaging theory provides a consistent method for upscaling conservation and thermodynamic equations for application in the study of porous medium systems. The method provides dynamic equations for phases, interfaces, and common curves that are closely based on insights from the entropy inequality. All larger scale variables in the equations are explicitly defined in terms of their microscale precursors, facilitating the determination of important parameters and macroscale state equations based on microscale experimental and computational analysis. The method requires that all assumptions that lead to a particular equation form be explicitly indicated, a restriction which is useful in ascertaining the range of applicability of a model as well as potential sources of error and opportunities to improve the analysis.

A step-by-step guide to the Tree of Life and the Four Worlds of the Qabalists. Gray is the foremost authority on magic and the Qabalah.

A complete treatise and practical guide to ceremonial magic and magical rituals.

For students on the magical path, this new tarot study will show you how to combine the tarot with the Sangreal symbolism for your own conscious development. Knowing how to work with the cards opens the door for a personal journey so you can incorporate magical and kabbalistic techniques into your daily life.

Thermodynamically constrained averaging theory provides a consistent method for upscaling conservation and thermodynamic equations for application in the study of porous medium systems. The method provides dynamic equations for phases, interfaces, and common curves that are closely based on insights from the entropy inequality. All larger scale variables in the equations are explicitly defined in terms of their microscale precursors, facilitating the determination of important parameters and macroscale state equations based on microscale experimental and computational analysis. The method requires that all assumptions that lead to a particular equation form be explicitly indicated, a restriction which is useful in ascertaining the range of applicability of a model as well as potential sources of error and opportunities to improve the analysis.

In the early 1970s the redoubtable old occultist William G. Gray bicycled from his Gloucestershire home to the Rollright stone circle in Oxfordshire on a clear and full-mooned summer night. The visionary experiences he encountered on that night and in other similar visits resulted in the writing of this book, originally published by Helios Books in 1975 and now a classic among pagan and craft traditions. The text of the ritual is given in full, along with a discussion of its pattern and purpose. The Rollright Ritual is a powerful initiatory rite for attuning oneself to a personal and communal path of spiritual growth, presented here with an explanatory text and a discussion of the spiritual lives and practices of the stone circle builders of Great Britain. "Somehow, we ought to get away from ideas that a Standing Stone is only an outworn sign of our past, and see it as an upraised Finger of Fate beckoning us ahead toward our future. The Stone is not merely a memorial of bygone beliefs, but a pointer that should raise our highest hopes of finding faith in all the Life that lies ahead of us."

As an "omniscient and obnoxious" teenager in 1969, Alan Richardson wrote to the occult author William G. Gray in pursuit of instant magical enlightenment. While he didn't quite get that, it was the beginning of a correspondence lasting many years in which Gray generously shared his magical knowledge and experience. Gray's letters, witty, ascerbic and blunt, contain a wealth of hints and tips on working and using Qabalah, his views on Dion Fortune, sex magic, initiation, joining magical groups, and how to stay on the straight and true path to Light regardless of what life flings at you. How does free-will relate to Destiny? Why do many great Adepts behave like idiots if they're in contact with Higher Powers? Is sex incompatible with a spiritual path? He addresses the questions which weigh on the mind of every magical seeker - always with the proviso that true wisdom can only be reached from within oneself. The letters are a delight to read and show the humour and understanding which shine through Gray's famously unsentimental character. They will be of direct practical value to anyone pursuing a magical path of any kind, Qabalistic or otherwise, and his advice to his young apprentice is every bit as pertinent today as it was back then.

Seasonal rites are as old as the hills on which they were once practised by most of humanity. Periodically, in accordance with the natural tides of nature and the times indicated by the sun and moon, people came together to make dedicated representations of the things that bound them closest to the cosmic wheel of life. In this absorbing work, William G. Gray demonstrates the continuing relevance of such practices in modern society. The actions of the rites are performed in a circle which symbolises the cosmic course, the magical practices consisting of music, movement, meditation and meaning. Detailed scripts are given for conducting the quarterly rites of Spring, Summer, Autumn and Winter, with complete texts of the chants, songs and invocations for each season. Seasonal Occult Rituals was originally published in 1970, now available again for the first time in forty years. "A welcome and valuable addition to the literature of Western occultism ... clear and without pretentiousness." - Doreen Valiente

In The Talking Tree W.G. Gray presents an encyclopaedic and systematic analysis of the 22 Paths of the Qabalistic Tree of Life and the archetypal principles underlying them in each of the 'four worlds'. This unique work by a leading Qabalist of his generation includes a detailed and comprehensive study of the symbolism of the Tarot, in which he offers an alternative method of allocating the Major Arcana to the Paths in place of the commonly used Golden Dawn system. He also explains how the Western alphabet can be applied to the Tree of Life as a viable alternative to Hebrew letters. This book is a priceless reference work for the serious Qabalah student who has already studied the ten Sephiroth and is looking to move on to the Paths. As well as explaining the function of God-names, archangels, angelic orders and mundane archetypes for each Path, Gray seeks to demonstrate that the Tree of Life is in a continual state of growth and evolution, and that those who study and work with the Qabalah should not be afraid to apply new correspondences to it and rethink some of the traditional assumptions.

1965-1967 ...As the New Age seemed to explode into being, everything spiritual had to be Eastern. Psychedelic artwork showed Glastonbury Tor overshadowed by the Maharishi Mahesh Yogi, or Stonehenge sending its energies up to Lord Krishna - imagery which William G. Gray summed up quite simply as "Balls." He was working hard to make sure that our weakened (or slumbering) Western Traditions would survive. Among his endeavours at the time was this guide to the inner and outer practicalities of ritual magic, which includes instruction on god-forms, words of power, magic circles, initiation, extension of consciousness and raising power through ritual. Previously unpublished, Working with Inner Light is the first new book by William G. Gray since the author's death in 1992. Written in the form of a journal or magical diary, it includes his original sketches, and forms a detailed course in modern Qabalistic magic which will be of immense value to esoteric students and practitioners working within the Western Mysteries today.

This compendium comprises six Kabbalistic works by William G. Gray, some of which are appearing here in print for the first time. The texts included in this compilation are ranging from the simplest introduction to the Spheres and Paths of the Kabbalistic Tree of Life system, to related meditation techniques and associated ritual magical procedures, to an advanced system of what could be termed "inter-dimensional spiritual communication." The title "A BEGINNERS GUIDE TO LIVING KABBALAH" is perhaps somewhat misleading, as this compilation equally contains works of an advanced nature, and the ritual and meditation techniques addressed in this tome, pertain to both beginners as well as advanced practitioners of "Practical Kabbalah."

This textbook presents an understanding of how basic physical descriptions can be translated into mathematical analogues that provide an opportunity to investigate environmental processes. Examples come from a range of hydrologic, atmospheric, and geophysical problems. The emphasis is on simple examples and calculations that add to understanding. The book provides a sense for the meaning of mathematical expressions, a physical feel for their relations to processes, and confidence in working with mathematical solutions. The goal of this book, in essence, is to present the timeless basic physical and mathematical principles and philosophy of environmental modeling, often to students who need to be taught how to think in a different way than they would for more narrowly-defined engineering or physics problems. Minimum prerequisites for the student reader include a knowledge of calculus through differential equations, but the book provides the mathematical and physical tools needed as the occasion arises.