Grumbine's "Clairvoyance" takes the form of a series of short lessons each with an experiment in mind to increase clairvoyance. Written at the end of the 19th century, it displays the normal pseudo-occult references to magnetism and electricity common at the time and comes courtesy of an offshoot Rosicrucian group known as the Order of the White Rose.Much of the content here relates to natural law or to the spiritual counterpart of the same.