The relations between Douglas Stone and the notorious Lady Sannox were very well known both among the fashionable circles of which she was a brilliant member, and the scientific bodies which numbered him among their most illustrious confreres. There was naturally, therefore, a very widespread interest when it was announced one morning that the lady had absolutely and for ever taken the veil, and that the world would see her no more. When, at the very tail of this rumour, there came the assurance that the celebrated…