78 CLASSIFICATION OF SHELLS.
" this belongs to the first division; it has only one piece."
" And this muscle," said Edward, " is a bivalve, I do not see a multi-valve in this collection."
Mrs. Ashton soon found one.
" Now, mamma," said Lewis, " before you tell us the name, will you show me how to set about finding it for myself?"
"Willingly," said Mrs. Ashton; " it is always pleasant to help those who try to help themselves : but in this instance perhaps Edward will lend his assistance; and I shall then have the additional satisfaction of knowing that he does not forget what he has once learned."
" Mamma taught me," said Edward, " that there are but three