I was horrified by my first glimpse of Holmes next morning, for he sat by the fire holding his tiny hypodermic syringe. I associated that instrument with the single weakness of his nature, and I feared the worst when I saw it glittering in his hand. He laughed at my expression of dismay and laid it upon the table.
"No, no, my dear fellow, there is no cause for alarm. It is not upon this occasion the instrument of evil, but it will rather prove to be the key which will unlock our mystery. On this syringe I base all my hopes. I have just returned from a small scouting expedition, and everything is favourable. Eat a good breakfast, Watson, for I propose to get upon Dr. Armstrong's trail to-day, and once on it I will not stop for rest or food until I run him to his burrow."
"In that case," s
