Dec. 3, Mr. Arthur Bayly, one of the Fellows of the R. Society, presented them with a piece of this Linnen in the name of Mr. Waite. At the same time, the same Mr. Bayly presented Dr. Plot with another piece of it, which being brought to Oxford the Experiment was again repeated on it (Dec. 16.) it being put into a strong Charcoal fire in the Natural History School, in a full meeting of the Philosophical Society of that University; where after it had continued red hot for some considerable time, it was taken forth again little altered when cold, saving that it seemed a little whiter and cleaner than before it was put in; as appears upon the Journal of that Society. Concerning which, Dr. Plot, being desired to offer his thoughts, drew up the following Discours, which was read before the said Society, June the 23d An. 1685.