"Kemshead says in his “ Inorganic Chemistry” that “the element hydrogen was first mentioned in the sixteenth century by Paracelsus, but very little was known of it in any way.” (P. 66.) And why not be fair and confess at once that Paracelsus was the re-discoverer of hydrogen as he was the re-discoverer of the hidden properties of the magnet and animal magnetism ? It is easy to show that according to the strict vows of secrecy taken and faithfully observed by every Rosicrucian (and especially by the alchemist) he kept his knowledge secret. Perhaps it would not prove a very difficult task for Any chemist well versed in the works of Paracelsus to demonstrate that oxygent the discovery of which is credited to Priestley, was known to the Rosicrucian alchemists as well as hydrogen. (footnote p. 52)"