Films of course were unknown when the stories appeared, and when these rights were finally discussed and a small sum offered for them by a French Company it seemed treasure trove and I was very glad to accept. Afterwards I had to buy them back again at exactly ten times what I had received, so the deal was a disastrous one. But now they have been done by the Stoll Company with Eille Norwood as Holmes, and it was worth all the expense to get so fine a production. Norwood has since played the part on the stage and won the approbation of the London public. He has that rare quality which can only be described as glamour, which compels you to watch an actor eagerly even when he is doing nothing. He has the brooding eye which excites expectation and he has also a quite unrivalled power of disguise. My only criticism of the films is that they introduce telephones, motor cars and other luxuries of which the Victorian Holmes never dreamed.

People have often asked me whether I knew the end of a Holmes story before I started it. Of course I do. One could not possibly steer a course if one did not know one’s destination. The first thing is to get your idea. Having got that key idea one’s next task is to conceal it and lay emphasis upon everything which can make for a different explanation. Holmes, however, can see all the fallacies of the alternatives, and arrives more or less dramatically at the true solution by steps which he can describe and justify. He shows his powers by what the South Americans now call “Sherlockholmitos,” which means clever little deductions which often have nothing to do with the matter in hand, but impress the reader with a general sense of power. The same effect is gained by his offhand allusion to other cases. Heaven knows how many titles I have thrown about in a casual way, and how many readers have begged me to satisfy their curiosity as to “Rigoletto and his abominable wife,” “The Adventure of the Tired Captain,” or “The Curious Experience of the Patterson Family in the Island of Uffa.” Once or twice, as in “The Adventure of the Second Stain,” which in my judgment is one of the neatest of the stories, I did actually use the title years before I wrote a story to correspond.

There are some questions concerned with particular stories which turn up periodically from every quarter of the globe. In “The Adventure of the Priory School” Holmes remarks in his offhand way that by looking at a bicycle track on a damp moor one can say which way it was heading. I had so many remonstrances upon this point, varying from pity to anger, that I took out my bicycle and tried. I had imagined that the observations of the way in which the track of the hind wheel overlaid the track of the front one when the machine was not running dead straight would show the direction. I found that my correspondents were right and I was wrong, for this would be the same whichever way the cycle was moving. On the other hand the real solution was much simpler, for on an undulating moor the wheels make a much deeper impression uphill and a more shallow one downhill, so Holmes was justified of his wisdom after all.

Sometimes I have got upon dangerous ground where I have taken risks through my own want of knowledge of the correct atmosphere. I have, for example, never been a racing man, and yet I ventured to write “Silver Blaze,” in which the mystery depends upon the laws of training and racing. The story is all right, and Holmes may have been at the top of his form, but my ignorance cries aloud to heaven. I read an excellent and very damaging criticism of the story in some sporting paper, written clearly by a man who did know, in which he explained the exact penalties which would have come upon every one concerned if they had acted as I described. Half would have been in jail and the other half warned off the turf for ever. However, I have never been nervous about details, and one must be masterful sometimes. When an alarmed Editor wrote to me once: “There is no second line of rails at that point,” I answered, “I make one.” On the other hand, there are cases where accuracy is essential.

I do not wish to be ungrateful to Holmes, who has been a good friend to me in many ways. If I have sometimes been inclined to weary of him it is because his character admits of no light or shade. He is a calculating machine, and anything you add to that simply weakens the effect. Thus the variety of the stories must depend upon the romance and compact handling of the plots. I would say a word for Watson also, who in the course of seven volumes never shows one gleam of humour or makes one single joke. To make a real character one must sacrifice everything to consistency and remember Goldsmith’s criticism of Johnson that “he would make the little fishes talk like whales.”

I do not think that I ever realized what a living actual personality Holmes had become to the more guileless readers, until I heard of the very pleasing story of the char-à-bancs of French schoolboys who, when asked what they wanted to see first in London, replied unanimously that they wanted to see Mr. Holmes’ lodgings in Baker Street. Many have asked me which house it is, but that is a point which for excellent reasons I will not decide.

There are certain Sherlock Holmes stories, apocryphal I need not say, which go round and round the press and turn up at fixed intervals with the regularity of a comet.

One is the story of the cabman who is supposed to have taken me to an hotel in Paris. “Dr. Doyle,” he cried, gazing at me fixedly, “I perceive from your appearance that you have been recently at Constantinople. I have reason to think also that you have been at Buda, and I perceive some indication that you were not far from Milan.” “Wonderful. Five francs for the secret of how you did it?” “I looked at the labels pasted on your trunk,” said the astute cabby.

Another perennial is of the woman who is said to have consulted Sherlock. “I am greatly puzzled, sir. In one week I have lost a motor horn, a brush, a box of golf balls, a dictionary and a bootjack. Can you explain it?” “Nothing simpler, madame,” said Sherlock. “It is clear that your neighbour keeps a goat.”

There was a third about how Sherlock entered heaven, and by virtue of his power of observation at once greeted Adam but the point is perhaps too anatomical for further discussion.