Collected Theosophical Essays. Thirty-one essays in one volume, on theosophy, the occult, and spiritualism. Selected contents: Nature-spirits or elementals; Aum; Masters of wisdom; Zoroastrianism: an afterword; Platonic philosopher's creed; Christian Rosenkreuz and the Rosicrucians; On the cave of the nymphs in the 13th book of the Odyssey; Pythagoric sentences of Demophilus.