The double line a little above the wrist, where the typewritist presses against the table, was beautifully defined The sewing-machine, of the hand type, leaves a similar mark, but only on the left arm, and on the side of it farthest from the thumb, instead of being right across the broadest part, as this was One was buttoned only in the two lower buttons out of five, and the other at the first, third, and fifth “I noted, in passing, that she had written a note before leaving home but after being fully dressed You observed that her right glove was torn at the forefinger, but you did not apparently see that both glove and finger were stained with violet ink She had written in a hurry and dipped her pen too deep It must have been this morning, or the mark would not remain clear upon the finger All this is amusing, though rather elementary, but I must go back to business, Watson Would you mind reading me the advertised description of Mr Hosmer Angel?” I held the little printed slip to the light “Missing,” it said, “on the morning of the fourteenth, a gentleman named Hosmer Angel in height; strongly built, sallow complexion, black hair, a little bald in the centre, bushy, black side-whiskers and moustache; tinted glasses, slight infirmity of speech Was dressed, when last seen, in black frock-coat faced with silk, black waistcoat, gold Albert chain, and grey Harris tweed trousers, with brown gaiters over elastic-sided boots Known to have been employed in an office in Leadenhall Street “As to the letters,” he continued, glancing over them, “they are very commonplace Absolutely no clue in them to Mr Angel, save that he quotes Balzac once There is one remarkable point, however, which will no doubt strike you.” “They are typewritten,” I remarked “Not only that, but the signature is typewritten Look at the neat little ‘Hosmer Angel’ at the bottom There is a date, you see, but no superscription except Leadenhall Street, which is rather vague However, I shall write two letters, which should settle the matter One is to a firm in the City, the other is to the young lady’s stepfather, Mr Windibank, asking him whether he could meet us here at six o’clock to-morrow evening It is just as well that we should do business with the male relatives A professional case of great gravity was engaging my own attention at the time, and the whole of next day I was busy at the bedside of the sufferer I found Sherlock Holmes alone, however, half asleep, with his long, thin form curled up in the recesses of his armchair A formidable array of bottles and test-tubes, with the pungent cleanly smell of hydrochloric acid, told me that he had spent his day in the chemical work which was so dear to him “Well, have you solved it?” I asked as I entered It was the bisulphate of baryta.” “No, no, the mystery!” I cried I thought of the salt that I have been working upon There was never any mystery in the matter, though, as I said yesterday, some of the details are of interest “This is the girl’s stepfather, Mr “He has written to me to say that he would be here at six He shot a questioning glance at each of us, placed his shiny top-hat upon the sideboard, and with a slight bow sidled down into the nearest chair “I think that this typewritten letter is from you, in which you made an appointment with me for six o’clock?” “Yes, sir I am afraid that I am a little late, but I am not quite my own master, you know I am sorry that Miss Sutherland has troubled you about this little matter, for I think it is far better not to wash linen of the sort in public It was quite against my wishes that she came, but she is a very excitable, impulsive girl, as you may have noticed, and she is not easily controlled when she has made up her mind on a point Of course, I did not mind you so much, as you are not connected with the official police, but it is not pleasant to have a family misfortune like this noised abroad Besides, it is a useless expense, for how could you possibly find this Hosmer Angel?” “On the contrary,” said Holmes quietly; “I have every reason to believe that I will succeed in discovering Mr Windibank gave a violent start and dropped his gloves “I am delighted to hear it,” he said “It is a curious thing,” remarked Holmes, “that a typewriter has really quite as much individuality as a man’s handwriting Unless they are quite new, no two of them write exactly alike Some letters get more worn than others, and some wear only on one side Now, you remark in this note of yours, Mr “And now I will show you what is really a very interesting study, Mr “I think of writing another little monograph some of these days on the typewriter and its relation to crime It is a subject to which I have devoted some little attention