Okay, okay, it’s not really a gem, except in the sense that it’s interesting to read an early example of utter and complete mumbo jumbo. Occult Chemistry, by Annie Besant and Charles W. Leadbeater is an extensive, detailed, and complete description of chemistry as revealed to the authors through clairvoyance. Published in 1919, the exact nature of elements was still fairly new: Rutherford had proposed his planetary model of the atom in 1911. Still, this had to have been considered craziness of the highest order, even in 1919.

A quote, just to give the flavor:

I remember the occasion vividly. Mr. Leadbeater was then staying at my house, and his clairvoyant faculties were frequently exercised for the benefit of myself, my wife and the theosophical friends around us. I had discovered that these faculties, exercised in the appropriate direction, were ultra-microscopic in their power. It occurred to me once to ask Mr. Leadbeater if he thought he could actually see a molecule of physical matter. He was quite willing to try, and I suggested a molecule of gold as one which he might try to observe. He made the appropriate effort, and emerged from it saying the molecule in question was far too elaborate a structure to be described. It evidently consisted of an enormous number of some smaller atoms, quite too many to count; quite too complicated in their arrangement to be comprehended. It struck me at once that this might be due to the fact that gold was a heavy metal of high atomic weight, and that observation might be more successful if directed to a body of low atomic weight, so I suggested an atom of hydrogen as possibly more manageable. Mr. Leadbeater accepted the suggestion and tried again. This time he found the atom of hydrogen to be far simpler than the other, so that the minor atoms constituting the hydrogen atom were countable. They were arranged on a definite plan, which will be rendered intelligible by diagrams later on, and were eighteen in number.