very large and lustrous pearl. No word of writing was enclosed. Since then every year upon the same date there has always appeared a similar box, containing a similar pearl, without any clue as to the sender. They have been pronounced by an expert to be of a rare variety and of considerable value. You can see for yourselves that they are very handsome.'
She opened a flat box as she spoke, and showed me six of the finest pearls that I had ever seen.
'Your statement is most interesting,' said Sherlock Holmes. 'Has anything else occurred to you?'
'Yes, and no later than to-day. That is why I have come to you. This morning I received this letter, which you will perhaps read for yourself.'
'Thank you,' said Holmes. 'The envelope too, please. Post-mark, London, S.W.
