It was so small that a rat could hardly pass through." "I knew that we should find a ventilator before ever we came to Stoke Moran." "My dear Holmes!" "Oh, yes, I did.

You remember in her statement she said that her sister could smell Dr.Roylott's cigar.

Now, of course that suggested at once that there must be a communication between the two rooms.

It could only be a small one, or it would have been remarked upon at the coroner's inquiry.

I deduced a ventilator." "But what harm can there be in that ?" "Well, there is at least a curious coincidence of dates.