“As Mr. Crookes tells us, Professor Thury refutes “all these explanations, and considers the effects due to a peculiar substance, fluid, or agent, pervading in a manner similar to the luminiferous ether of the scientists, all matter, nervous, organic or inorganic, which he terms psychode.
He enters into full discussion as to the properties of this state, or form, or matter, and proposes the term ectenic force…for the power exerted when the mind acts at a distance through the influence of the psychode.”
Mr. Crooke’s further remarks that, “Professor Thury’s ectenic force, and his own ‘psychic force’ are evidently equivalent terms.”
We certainly could very easily demonstrate that the two forces are identical, moreover, the astral or sidereal light as explained by the alchemists and Eliphas Levi, in his Dogme et Rituel de la Haute Magie; and that, under the name of AKASA, or life-principle, this all-pervading force was known to the gymnosophists, Hindu magicians, and adepts of all countries, thousands of years ago; and, that it is still known to them, and used at present by the Tibetan lamas, fakirs, thaumaturgists of all nationalities, and even by many of the Hindu “jugglers”.”
H. P. Blavatsky
The Mark Of God: Understanding Your "I AM Presence" 