This book is a compilation from 40 mainworks published between 1897 and 1921 and in view of their wide range and in view of their wide range and the painstaking view with which they were extracted, the collated information may fairly be taken to summarize the general views upon the subject up to 1925.Much of the contents of this book is derived from the exercise of ESP and although contents may be accurate, there is as yet, no accepted method of confirming them.The Etheric Double is a subtle body of fine matter--physical by nature, but generally invisible to the physical eye. It is the material which may form the phenomena of apparitions. It is also known as the health aura.