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Pneumonia. An inflammation affecting the air cells of the lungs. Any substance, which, when applied externally, or taken into the stomach or the blood, works such a change in the animal economy as to produce disease or death. Pons Varolii. Bridge of Varolius. The white fibers which form a bridge connecting the different parts of the brain, first described by Varolius.

Mondino, Bertrucci, Salicet, Lanfranc, Baverius, Berengarius, John De Vigo, who first wrote on gun-shot wounds; John of Arcoli, first to mention gold filling and other anticipations of modern dentistry; Varolius, Eustachius, Cæsalpinus, Columbus, Malpighi, Lancisi, Morgagni, Spallanzani, Galvani, Volta, were all Italians.

After that comes modern medicine, for with the sixteenth century the names and achievements of the workers in medicine are familiar Paracelsus, Vesalius, Columbus, Servetus, Cæsalpinus, Eustachius, Varolius, Sylvius are men whose names are attached to great discoveries with which even those who are without any pretence to knowledge of medical history are not unacquainted.

But it does please me to read the first descriptions of parts to which the names of their discoverers or those who have first described them have become so joined that not even modern science can part them; to listen to the talk of my old volume as Willis describes his circle and Fallopius his aqueduct and Varolius his bridge and Eustachius his tube and Monro his foramen, all so well known to us in the human body; it does please me to know the very words in which Winslow described the opening which bears his name, and Glisson his capsule and De Graaf his vesicle; I am not content until I know in what language Harvey announced his discovery of the circulation, and how Spigelius made the liver his perpetual memorial, and Malpighi found a monument more enduring than brass in the corpuscles of the spleen and the kidney.

But it does please me to read the first descriptions of parts to which the names of their discoverers or those who have first described them have become so joined that not even modern science can part them; to listen to the talk of my old volume as Willis describes his circle and Fallopius his aqueduct and Varolius his bridge and Eustachius his tube and Monro his foramen, all so well known to us in the human body; it does please me to know the very words in which Winslow described the opening which bears his name, and Glisson his capsule and De Graaf his vesicle; I am not content until I know in what language Harvey announced his discovery of the circulation, and how Spigelius made the liver his perpetual memorial, and Malpighi found a monument more enduring than brass in the corpuscles of the spleen and the kidney.

Very little has been added to the microscopic anatomy of the teeth since Eustachius' time. He had the advantage, of course, of being intimately in contact with the great group of Renaissance anatomists, Vesalius, Columbus, Varolius, Fallopius, and the others, the great fathers of anatomy.