"Etheric. It is not alone through the brain to which we have hitherto been referring, however, that impressions may be received by the man. Almost exactly co-extensive with and interpenetrating its visible form is his etheric double (formerly called in theosophical literature the linga sharira), and that also has a brain which is really no less physical than the other, though composed of matter in a condition finer than the gaseous. Ch 2"