Chapter

 1 V |    Harry often repeated. “The presence of an unknown being in the
 2 VI|       have you recognized the presence of light carburetted hydrogen?”~“
 3 VI|       only really betrays its presence by an explosion.”~“Mr. Starr,”
 4 VI|   were evidently owing to the presence of fire-damp, and to me
 5 VI|       wished to ascertain the presence of fire-damp. Do you remember
 6 VI|    its means I discovered the presence of firedamp and consequently
 7 VI|       it had not revealed the presence of the explosive gas. At
 8 VI| crackling which indicates the presence of a small quantity of firedamp.
 9 VI|        there they were in the presence of an undeniable fact— the
10 XI|      slightest way betray his presence.~Harry, becoming more suspicious