affair up to this point would be insignificant. Our difficulties are still before us. But perhaps we may find something here which may help us.”
We had ascended the kitchen stair and entered the suite of rooms upon the first floor. One was a dining-room, severely furnished and containing nothing of interest. A second was a bedroom, which also drew blank. The remaining room appeared more promising, and my companion settled down to a systematic examination. It was littered with books and papers, and was evidently used as a study. Swiftly and methodically Holmes turned over the contents of drawer after drawer and cupboard after cupboard, but no gleam of success came to brighten his austere face. At the end of an hour he was no further than when he started.
“The cunning dog has covered his tracks,” said he. “He has left nothing to incriminate him. His dangerous correspondence has been destroyed or removed. This is our last chance.”
It was a small tin cash-box which stood upon the writing-desk. Holmes prised it open with his chisel. Several rolls of paper were within, covered with figures and calculations, without any note to show to what they referred. The recurring words, “Water pressure” and “Pressure to the square inch” suggested some possible relation to a submarine. Holmes tossed them all im-
