Then on the fifteenth of April a strange development occurred. While nothing appeared to grow different in kind, there was certainly a very terrible difference in degree; and Dr. Willett somehow attaches great significance to the change. The day was Good Friday, a circumstance of which the servants made much, but which others quite naturally dismiss as an irrelevant coincidence. Late in the afternoon young Ward began repeating a certain formula in a singularly loud voice, at the same time burning some substance so pungent that its fumes escaped over the entire house. The formula was so plainly audible in the hall outside the locked door that Mrs. Ward could not help memorising it as she waited and listened anxiously, and later on she was able to write it down at Dr. Willett's request. It ran as follows, and experts have told Dr. Willett that its very close analogue can be found in the mystic writings of "Eliphas Levi", that cryptic soul who crept through a crack in the forbidden door and glimpsed the frightful vistas of the void beyond: