VITRIOL 



1608 



VOLUME 



Vitriol (vit'-re-ol) [vitriolum; vitrum, glass]. In 

 chemistry, a term formerly used to designate any sub- 

 stance having a glassy fracture or appearance. V., 

 Blue, copper sulphate, or " blue stone," CuSO^. V., 

 Green, ferrous sulphate, or "copperas," FeS0 4 . V., 

 Oil of, sulphuric acid, H 2 SO v V., White, zinc sul- 

 phate, ZnS0 4 . 



Vitta (vit'-ah) [vitta, a band, a fillet: pi., Vitta;']. In 

 biology, (a) a band, or stripe, either of color or tissue ; 

 (b) one of the longitudinal, tubular oil-receptacles in 

 the fruits of the Umbellifera. An oil-tube. 



Vittate {vit'-dt) [vitta, a band, a fillet]. Possessing 

 vittse. 



Vitular (vif '-u-lar) \yitidus, calf]. Relating to a calf 

 or to calving. V. Apoplexy, apoplexy of cows oc- 

 curring at parturition. V. Fever, vitular apoplexy, or, 

 more correctly, a fever following parturition in the 

 cow. See Collapse, Parturient. 



Vitus' Dance, St. See Chorea. 



Viviparous {viv-ip' -ar-us) \yivus, alive ; parere, bring 

 forth, produce]. In biology, applied to such animals 

 as bring forth the young at an advanced stage of de- 

 velopment, as distinguished from oviparous and ovovi- 

 viparous. 



Vivipation ( viv- ip - a f - shun ) \yivus, alive ; parere, to 

 bring forth]. In embryology, that form of generation 

 in which the ovum, expelled from the ovary, clings to 

 the maternal organ and derives its nourishment directly 

 from the mother until birth. 



Viviperception (viv-ip-er-sep' '-shun) [vivus, alive ; per- 

 cipere, to perceive]. The study or observation of 

 physiologic processes without dissection or vivisection. 



Vivisection (viv-is-eW -shun) [vivus, alive ; sectio, cut- 

 ting]. The dissection of an animal, or experimenta- 

 tion upon it, while still alive, for scientific purposes. 

 See Calliseclion, and Sentisection. 



"Vivisectionist (viv-is-eh'-shun-ist) [vivus, alive; sectio, 

 a cutting]. A practiser or defender of vivisection. 



Vivisector (viv-is-ek' '-tor) [vivus, alive ; sector, a cutter]. 

 One who practises vivisection. 



Vivisectorium [viv-is-ek-to' -re-um) [L.]. A place or 

 laboratory where vivisection is performed. 



Vleminckx's Solution. An application used in 

 Austria and Germany for treating acne. It consists 

 of lime I part, sulphur 2 parts, and water 20 parts. 

 Slake the lime, add the sulphur, and boil to 12 parts. 



Vocal (yo'-kal) [vox, the voice]. Pertaining to the 

 voice or its organs. V. Bands, a name given to cer- 

 tain membranes of the larynx by which the sounds of 

 the voice are produced. They consist of superior, 

 ventricular or false bands, and inferior or true bands. 

 The latter are covered by the mucous membrane of 

 the larynx and are thin bands of elastic tissue, reach- 

 ing from the wings of the thyreoid to the arytenoid 

 cartilages. V. Fremitus, the thrill conveyed to the 

 hand when applied to the chest during phonation. 

 It is . increased in consolidation of the lungs, and 

 decreased or absent when there is a pleural effusion. 

 V. Resonance, the resonance produced by the voice 

 as heard on auscultating the lung. This is increased 

 with slight degrees of consolidation of the lung and 

 decreased with extreme consolidation and with large 

 pleural effusions. 



Vogt, Angle of. See Angle. 



Vohsen's Method. A method of illuminating the 

 frontal sinus. It is done by placing the source of il- 

 lumination over the orbital surface of the sinus. 



Voice (vois) [MM, voice, voice]. The sound produced 

 by the vibration of the vocal bands and modified by 

 the resonance-organs. The utterance of articular 

 sounds. V., Change of. In the transition-period of 

 youth the voice loses its treble quality and (sometimes 



irregularly) assumes the qualities of the adult voice. 

 This is called the change of voice. 



Void [ME., voiden, to void]. To evacuate, e.g. , from 

 the intestine or bladder. 



Voisin's Method. See Hypnotism. 



Vola (yo'-lah) [L.: gen. and//., Volm\. The palm, or 

 rather the hollow of the hand ; the hollow of the foot. 



Volar (vo'-lar) [yolaris ; vola, palm]. Pertaining to 

 the palm of the hand. See Palmar. 



Volatic (vo-laf -ik) [yolaticus ; volare, to fly]. Flying 

 momentary. 



Volatile (vol'-at-il) [volatilis~\. Capable of assuming, 

 or prone to assume a state of vapor ; evaporating. V. 

 Oils. See Essential Oils. 



Volatility (vol-at-il'-it-e) [volatilitas\ The quality of 

 being volatile. 



Volatilization (vol-at-il-iz-a' -shun) [volatilizatio~\ . The 

 change of a solid or liquid to a gas or vapor by heat. 



Volhard, Volumetric Method of. A method 1 

 timating halogens by means of ammonium sulpho- 

 cyanid. 



Volition (z'o-Iish'-un) [volitio, will]. The will or de- 

 termination to act. 



Volitional (%<o-lish f -un-al) [volitio, will]. Pertaining 

 to volition. V. Insanity, insanity characterized by 

 perversions of the will, or by abulia or hyperbulia. 



Volitive (vol'-it-iv) [volitio, will]. Pertaining to the 

 will; volitional. 



Volkmann's Deformity. Congenital tibio-tarsal luxa- 

 tion. See Diseases, Table of. V.'s Solution. 

 Thymol. 



Volsella (vol-sel'-ah) [vellere, to pluck] . A f ■ 

 having one or more hooks at the end of each Made 

 Also called Vulsella. 



Volt (volt) [volvere, to turn around]. The unit of elec- 

 tro-motive force, or the force sufficient to cause a cur 

 rent of one ampere to flow against a resistance < 

 ohm. The following is the voltage of several po 

 cells: Smee 0.65, Bunsen 1.90, Daniell 1.05. 

 laud 0.60, Leclanche 1.50. V. -ampere, the amount 

 of pressure developed by a current of one ai 

 having an electro-motive force of one volt. It 

 chanic equivalent is about 44. 2 foot-pounds per m i 

 It is sometimes called a Watt. See Electric ; 

 V. -coulomb. See Electric Units. 



Volta's Law. A law for the differences of el 

 potential produced by the contact of dissimilar n 

 or other substances. See Law. 



Voltaic (vol-ta'-ik) [Volta, an Italian scientist], 

 taining to the constant electric current or to gal 

 electricity. V. Alternatives, a term used in rm 

 electricity to indicate sudden reversals in the po 

 of the electrodes of a voltaic battery. 



Voltaism (vol'-ta-izni). See Galvanism. 



Voltameter (vol-tam' -et-er) [volt, a unit of electi 

 tive force; firrpov, a measure]. An instrument f' 

 ascertaining the electro-motive force of a i 

 volts. 



Voltmeter (volt'-me-ter) [volt, a unit of electric 

 fierpov, measure]. A synonym of Voltameter. 



Voltolini's Disease. A purulent, labyrinthim 

 accompanied with violent pains in the ear, complel 

 unconsciousness, high fever, and delirium. 

 Diseases. Table of. V.'s Method, the examinatio 

 of the anterior nasal region by means of transmits 

 light. This method is also called examination I 

 "through illumination," and transilluminat, 



Voluble (vol'-u-bl) [volubilis. whirling]. See /';<■/;/ m. 



Volume (vol'-um) \yolumen\ In physics, the spa', 

 which a substance fills. Cubic dimension. V 

 Specific, the molecular weight divided by tin 

 cific gravity ; referred to hydrogen as a unit. 



