are going to know all; and, without further preamble, I am going to place before your eyes the problem of "The Yellow Room" as it was placed before the eyes of the entire world on the day following the enactment of the drama at the Château du Glandier.
On the 25th of October, 1892, the following note appeared in the latest edition of the "Temps":—
"A frightful crime has been committed at the Glandier, on the border of the forest of Sainte-Geneviève, above Epinay-sur-Orge, at the house of Professor Stangerson. On that night, while the master was working in his laboratory, an attempt was made to assassinate Mademoiselle Stangerson, who was sleeping in a chamber adjoining this laboratory. The doctors do not answer for the life of Mdlle. Stangerson."
The impression made on Paris by this news may be easily imagined. Already, at that time, the learned world was deeply interested in the labours of Professor Stangerson and his daughter. These labours—the first that were attempted in radiography—served to open the way for Monsieur and Madame Curie to the discovery of radium. It was expected the Professor would shortly read to the Academy of Sciences a sensational paper on his new theory,—the Dissociation of Matter,—a theory destined to overthrow from its base the whole of official science, which based itself on the principle of the Conservation of Energy.
On the following day, the newspapers were full of the tragedy. The "Matin," among others, pub-
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