On the day when he took this decision, he got a letter from a patient whom he had sent to winter on the Nile.  She wrote from Luxor many details of her condition, which he read slowly and with care.  Towards the end of the letter, perhaps made frolicsome by confession, she broke into gossip, related several little scandals of various hotels, and concluded with this paragraph: 

“Quite an excitement has been caused here by the arrival of a marvellous dahabeeyah called the Loulia.  She is the most lovely boat on the Nile, I am told, and every one is longing to go over her.  But there is no chance for any of us.  In the first place the Loulia is tied up at the western bank, on the Theban side of the river, and, in the second place, she belongs for the season to the Nigel Armines.  And, as of course you remember, Mrs. Nigel Armine was Mrs. Chepstow, and utterly impossible.  Now she is married again she may think she will be received, but she never will be.  Of course, if she could have had the luck one day to become Lady Harwich, it might have become possible.  A great position like that naturally makes people think differently.  And, after all, the woman is married now.  But no use talking about it!  The twins have effectually knocked that possibility on the head.  They say she nearly went mad with fury when she heard the news.  It seems he had never given her a hint before the wedding.  Wise man!  He evidently knew his Mrs. Chepstow.  Nevertheless, to give the devil her due, I hear she seems quite wrapped up in her husband.  I saw him for a minute the other day, when I was crossing to go to the tombs of the Kings.  He was looking awfully ill, I thought, such an extraordinary colour!  I didn’t see her, but they say she looks younger than ever, and much more beautiful than when she was in London.  Marriage evidently suits her, though it doesn’t seem to suit him,” etc., etc.

This letter arrived by an evening post, and Isaacson read it after his day’s work was done.  When he had finished it, he took out from a drawer Nigel’s letter to him, which he had kept, and compared the two.  It was not necessary to do this, for Nigel’s words were in his memory.  Isaacson could not have said exactly why he did it.  The sight of the two letters side by side made a strongly disagreeable impression upon him, and perhaps, in comparing them thus, he had almost unconsciously been seeking such an impression.

“Never in my life have I been in such splendid health.”

“He was looking awfully ill—­such an extraordinary colour!”

What had happened between the writing of the first letter and the writing of the last?  What had produced this change?

After a few minutes, Isaacson put both the letters away and softly shut the drawer of the writing-table.  He had dined.  The night was his.  He had his nargeeleh brought, and told Henry that he was not to be disturbed.