The Poets, who on earth have made us heirs Of truth and pure delight by heavenly lays! In the mosaic of the vault are the names of lyric poets, six Americans occupying the penetrations on the north side: Longfellow, Lowell, Whittier, Bryant, Whitman, Poe; and the following English and foreign or ancient lyrists along the centre of the vault and in the south penetrations: Browning, Shelley, Byron, Musset, Hugo, Heine, Theocritus, Pindar, Anacreon, Sappho, Catullus, Horace, Petrarch, Ronsard. [Illustration: LYRIC POETRY.--BY H. O. WALKER.] =Mr. Alexander’s Paintings.=--In the East Corridor are six tympanums of the same size as the smaller panels of Mr. Walker and Mr. Pearce, by Mr. John W. Alexander, illustrating _The Evolution of the Book_. The subjects are, at the south end, _The Cairn_, _Oral Tradition_, and _Egyptian Hieroglyphics_; and at the north end, _Picture Writing_, _The Manuscript Book_, and _The Printing Press_. In the first of these, a company of primitive men, clad in skins, are raising a heap of stones on the seashore, perhaps as a memorial of some dead comrade, or to commemorate some fortunate event, or, perhaps, merely as a record to let others know the stages of their journey. In the second panel, an Arabian story-teller stands relating his marvellous tales in the centre of a circle of seated Arabs. The third shows a scaffolding swung in front of the portal of a newly erected Egyptian temple. A young Egyptian workman is cutting a hieroglyphic inscription over the door, while an Egyptian girl, his sweetheart, sits watching the work beside him. _Picture Writing_ represents a young American Indian, with a rudely shaped saucer of red paint beside him, depicting some favorite story of his tribe upon a dressed and smoothed deer-skin. An Indian girl lies near him, attentively following every stroke of his brush. The next panel gives the interior of a convent cell, with a monk, seated in the feeble light of a small window, laboriously illuminating in bright colors the pages of a great folio book. The last of the series shows Gutenberg, the inventor of printing, in his office: the master, with his assistant beside him, examining a proof-sheet, and discussing the principle of his great invention. To the right is an apprentice, swaying upon the handle-bar of the rude press.