would be very much more useful to him in the character of a free woman, 
and he knew that Sir Henry's falling in love with her could do no harm to
anyone except Sir Henry. He took particular care that Sir Henry did not make
love to her, as Dr. Watson himself observed. It was this man who had dogged
Sir Henry and Dr. Mortimer in London, and the warning received by Sir Henry 
came from his wife.
The reason I know this is because he so far forgot himself as to tell Dr.
Watson a true piece of autobiography upon the occasion when they first met,
and I dare say that Stapleton did many times regret it since.  He was once 
a schoolmaster in the North of England.  Now, there is no one more easy to
trace than a schoolmaster. There are scholastic agencies by which one may 
identify a man who has been in the profession. A little investigation
showed me that a school had come to grief under atrocious circumstances,
