"Why not?"
"The cave is too deep. It is not a true air pocket, and——"
"What is this? Here is another one, still larger, and lower down. Here, hold the candle." Harry was down in an instant.
"Probably this is what George saw."
True enough; it was an air pocket which extended in about fifty feet, and had no passageway beyond.
CHAPTER VII
INVESTIGATING THE PROSPECTOR'S HOLE
The knowledge that some marine animal inhabited the cave was now a constant topic, particularly with George, who was determined, sooner or later, to find out something more about it. With this end in view he made secret preparations, particularly in constructing a lamp which would not be liable to overturn or be put out by wind or in falling.
Thus far the only light available was obtained from candles made from the fat of the animals, and it was not the kind of illuminating material they had been used to. When people knew nothing better than tallow candles, that light was satisfactory, but when petroleum was once used tallow candles were entirely unsuitable and too primitive.