The author emphasizes his discovery is physical, not based on the occult. Kilner's findings are based on years of patient experiment and considerable supporting evidence. Contents: The aura of healthy persons; etheric double; inner aura; optical problems; effects of the different forces upon the aura; complementary colors; outer aura in disease; inner aura in disease; use of the complementary colored bands in disease; aura during pregnancy. Also contains 64 illustrations.