_DU MONCEL, Count._--The Telephone, the Microphone, and the Phonograph.
With 74 Illustrations. Third Edition. Small crown 8vo, 5_s._
_DUNN, H. Percy._--Infant Health. The Physiology and Hygiene of Early
Life. Crown 8vo.
_DURUY, Victor._--History of Rome and the Roman People. Edited by Prof.
MAHAFFY. With nearly 3000 Illustrations. 4to. 6 vols. in 12 parts,
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