It should be explained that Mrs. Silcox does not undertake to teach the pronunciation of the Greek and Latin tongues. Leonine verses are so called in honor of a poet named Leo, whom prosodists appear to find a pleasure in believing to have been the first to discover that a rhyming couplet could be run into a single line. LETTUCE, n. An herb of the genus Lactuca, "wherewith," says that pious gastronome, Hengist Pelly, "God has been pleased to reward the good and punish the wicked. For by his inner light the righteous man has discerned a manner of compounding for it a dressing to the appetency whereof a multitude of gustible condiments conspire, being reconciled and ameliorated with profusion of oil, the entire comestible making glad the heart of the godly and causing his face to shine. But the person of spiritual unworth is successfully tempted of the Adversary to eat of the lettuce with destitution of oil, mustard, egg, salt, and garlic, and with a rascal bath of vinegar polluted with sugar. Wherefore the person of spiritual unworth suffers an intestinal pang of strange complexity and raises the song." LEVIATHAN, n. An enormous aquatic animal mentioned by Job. Some suppose it to have been the whale, but that distinguished ichthyologer, Dr. Jordan, of Stanford University, maintains with considerable heat that it was a species of gigantic Tadpole, ('Thaddeus Polandensis) or Polliwig-- Maria pseudo-hirsuta. For an exhaustive description and history of the Tadpole consult the famous monograph of Jane Porter, Thaddeus of Warsaw.