The treasure that Major Sholto stole from the Sign of Four and hide at Pondicherry Lodge. Bartholomew Sholto estimated the value of the jewels to be in the region of half a million pounds. (The Sign of Four)

 

Holmes sank back into the velvet-lined armchair after injecting himself at the begining of The Sign of Four.

 

Holmes relapsed into his armchair and listened to Mr Wilson outline the story of the Red-Headed League. 

 

How Dr Watson describes Sherlock Holmes after the first visit to 221B Baker Street of Miss Mary Morstan, "You really are an automaton - a calculating machine". (The Sign of Four)