"I took a handful of powder, wet it, and then placed it on a board. Then I covered it over with a coat of wet clay, leaving a little hole at the top, with some dry powder on it."
"That was the crater," added Charles.
"Yes; and then I touched it off. It was in the evening, and it looked just like Mount Vesuvius in the panorama."
"Now, boys," continued Mrs. Sedley, "who can tell me what an ocean is?"
"The largest body of water," replied several.
"What shall represent the ocean here?"
"The lake."
"Very well; what is a sea?"
"A portion of water smaller than an ocean, and nearly surrounded by land."
"We are in one now," said Frank.