TRACHEA (Gr. _trachus_, rough). The windpipe. The term is derived from the inequality of its cartilages. TRICEPS. Having three heads. Applied to several muscles. TRICUSPID. Having three points. A term applied to three triangular fords or _valves_ situated between the right auricle and the right ventricle of the heart. TRIFACIAL. Triple-facial. A term applied to the fifth pair of nerves, the grand sensitive nerve of the head and face. TROCHANTER (Gr. _trocháo_, to run or roll). The name of two processes of the thigh-bone—the _major_ and the _minor_. TUNIC. The upper garment of the Romans. Hence it is applied to several membranes of the body. TYMPANUM (Gr. _túmpanon_, a drum). The drum of the ear. U ULNA (Gr. _olénē_, the cubit). The large bone of the fore-arm; so named from its being often used as a measure, under the term _ell_. UVEA (L. _uva_, grape). The posterior surface of the iris; so called from its resemblance in color to a ripe grape. V VACUUM (L. _vaccus_, empty). Literally, an empty place. This term generally denotes the interior of a close vessel, from which the atmospheric air and every other gas have been extracted. VALVE (L. _valvæ_, folding-doors). A close lid affixed to a tube or opening in some vessel, by means of a hinge or other movable joint, and which can be opened only in one direction. Hence it signifies a little membrane which prevents the return of fluid in the blood-vessels and absorbents. VALVULA (L. dim. of _valve_). A little valve. VAS, VASIS. Plural, _Vasa_. A vessel, or any utensil to hold liquor. VASCULAR SYSTEM. That part of the animal economy which relates to the vessels. VENOUS. Belonging to a vein. VENTRICULUS (L. dim. of _venter_, the belly). The term _ventricle_ is also applied to two cavities of the heart, and to several cavities in other parts of the body. VERTEBRA (L. _verto_, to turn). A bone of the spine; so named from its _turning_ upon the adjoining one. VERTEBRAL. Connected with the vertebra. VESSICLE (L. dim. of _vesica_, a bladder). A little bladder. VILLUS. Literally, the shaggy hair of beasts. Some of the membranes of the body, as the mucous membrane of the intestinal canal, present a surface of minute papillæ, termed _villi_, villosities, resembling a downy tissue, continually covered with fluid. VITREOUS BODY (L. _vitrum_, glass). _Vitreous humour._ A transparent mass, resembling melted glass, occupying the globe of the eye, and inclosed in the hyaloïd membrane. W WARM-BLOODED. A term applied to the mammalia and birds which have a two-fold circulation. X XYPHOID (Gr. _xíphos_, a sword, _eìdos_, likeness). Sword-like; a term applied to the cartilage of the sternum. THE END. Transcriber’s Notes pg 67 Changed: Alcohol and common salt both act in the preservavation to: Alcohol and common salt both act in the preservation