GLOSSARY. 203 



The operation of injecting blood taken from one person into the 

 veins of another; other fluids than blood are sometimes used. 



TJUCII-I'NA SPI-RA'LIS. (L.) A minute species of parasite or worm, 

 which infests the flesh of the hog, and which may be introduced 

 into the human system by eating pork not thoroughly cooked. 



TYM'PA-NUM (Gr. TV/J.TCO.VOV, tumpanon, a drum). The cavity of 

 the middle ear, resembling a drum in being closed by two mem- 

 branes, and in having communication with the atmosphere. 



U'vu-LA (L. uva, a grape). The small pendulous body attached to 

 the back part of the palate. 



VAS'CU-LAR (L. vas'culum, a little vessel). Pertaining to, or contain- 

 ing blood-vessels. 



VE'NOUS (L. v^na, a vein). Pertaining to, or contained within a 

 vein. 



VEN-TI-LA'TION. The introduction of fresh air into a room or build- 

 ing, in such a manner as to keep the air within it in a pure condi- 

 tion. 



VEN-TRIL'O-QUISM (L. ven'ter, the belly, and lo'quw, to speak). A 

 modification of natural speech by which the voice is made to 

 appear to come from a distance. The ancients supposed that the 

 voice was formed in the belly ; hence the name. 



VEN'TRI-CLES of the heart. The two largest cavities of the heart, 

 situated at its apex or point. 



VER'TE-BRAL COLUMN (L. ver'tebra, a joint). The back-bone, con- 

 sisting of twenty-four separate bones, called vertebrae, firmly jointed 

 together ; also called the spinal column and spine. 



VES'TI-BULE. A portion of the internal ear, communicating with the 

 semicircular canals and the cochlea ; so called from its fancied 

 resemblance to the vestibule or porch of a house. 



VIL'LI (L. vil'lus, the nap of cloth). Minute thread-like projections 

 found upon the internal surface of the small intestine, giving it a 

 velvety appearance. 



VIT'RE-OUS (L. >oi'trum, glass). Having the appearance of glass ; 

 applied to the humor occupying the largest part of the cavity of 

 the eyeball. 



VIV-I-SEC'TION (L. vi'vvj, alive, and se'co, to cut). The practice of 

 operating upon living animals, for the purpose of studying some 

 physiological process. 



VOCAL CORDS. Two elastic bands or ridges situated in the larynx : 

 they are the essential parts of the organs of tie voice. 



