The Hound of the Baskervilles chapter 4

What does the note that Sir Henry received at the hotel say?

Where did the author of Sir Henry's note get the words that were pasted onto the page?

What does Sir Henry say he has "mislaid"?

What do Holmes & Watson see that interests them when they follow Sir Henry & Dr. Mortimer?

What was the number of the cab?

What did Holmes & Watson both notice about the cab's occupant?

Where does Holmes send Cartwright?

What does Holmes want Cartwright to try to find?