-11IS 



bulum, the passage between the third ventricle of the 

 brain and the infundibulum. I. a palati ad aurem, 

 the Eustachian tube. I. a tertio ad quartum ventri- 

 culum, the aqueduct of Sylvia-., extending from the 

 third ventricle to the fourth. I. chordae anterius, 

 the aperture through which the chorda tympani nerve 

 leaves the tympanum. I. chordae posterius, the 

 aperture through which the chorda tympani nerve 

 enters the tympanum. I. dentium, the canal of the 

 permanent dental sac opening behind the correspond- 

 ing temporary tooth and through which the permanent 

 tooth ri>es. 



-itis (i'-lis) [mc, inflammation]. A suffix used to denote 

 inflammation. 



Ivory [if-vor-e) [ME., ivory, ivory]. The hard bone- 

 like substance of the tusks of elephants. I. -black. 

 See Carbo animalis, and Pigments, Conspectus tf. I., 



631 JACTITATION 



Dental. See Dentine. I. -brown. See Pigments, 

 Conspectus of. I. of Tooth. See Dentine. 



Ivy [i'-ve) [ME., ivy, ivy]. See Hedera. I. -pea, an 

 issue-pea made of the wood of the ivy. I., Poison. 

 See Rhus. 



Ixodes [iks-o'-dez) [J.;cjf5//c, sticky ; l^6g, bird-lime; eldog, 

 form]. An insect of the natural order Acaridea. See 

 Parasites {Animal}, Table of 



Ixyomyelitis (iks-e-o-mi-el-i'-tis) [i;i<\ waist; /uj 

 marrow; trig, inflammation]. Myelitis of the dorsal 

 region of the spinal cord; ischiomyelis ; osphyomy- 

 elilis. 



Izal [i f -zal). Thomcliffe disinfectant; a by-product 

 obtained in the process of coke formation ; it po^sese* 

 strung disinfectant properties without any irritating 

 quality. It mixes well with water, and has an agree- 

 able odor. L'nof. 



Jabber (jab'-er) [ME., fader, to chatter]. To talk 

 rapidly and indistinctly ; to chatter. 



Jaborandi {jab-or-an f -de) [Braz.]. The leaves of Pilo- 

 carpus pennalifolius, a valuable diaphoretic. See Pilo- 

 carpus. 



Jaborin {Jab'-or-in) [Braz., Jaborandi\, t'|,H 1B N 2 5 . 

 An alkaloid derivable from pilocarpi!) by the action of 

 heat and sulphuric acid. It is an amorphous, strongly 

 basic substance, and has properties resembling those 

 of atropin. L'nof. 



Jacaranda {jak-ar-an'-daE) [Brazilian]. A genus of 

 bignoniaceous plants of tropical America. J. caroba 

 is antisyphilitic, and is of service in the treatment of 

 urethritis, rheumatism, and skin-diseases. Dose of 

 the fl. ext. gtt. xvi-H. 7,]. J. lancifoliata, is used by 

 the natives of Brazil in urethritis. Dose of an :j ij to 

 ( >j tincture n^w ; of the fl. extract, gtt. xvi-xxx. 

 Unof. 



Jaccoud's Sign. Set Signs and Symptoms, Tabic of . 



Jack ( jak) [ME., Jacke, a personal name]. A popular 

 term for horse-flesh salted and subsequently washed in 

 order to deprive it of its peculiar taste. J. -knife 

 Posture. See Postures. 



Jacket (jak'-et) [Fr. , jacque, a coat of mail]. A short 

 coat. J., Bark, a jacket stuffed with powdered cin- 

 chona. J., Cotton, a jacket lined with cotton, some- 

 times used in the treatment of pneumonia. J., 

 Plaster-of- Paris, a mould of plaster of Paris cast 

 upon the body or part, for keeping it rigid and fixed 

 in a desired position, in sprain or dislocation of the 

 spine, etc. J. -poultice, a poultice applied about the 

 whole surface of the thorax ; it is sometimes used in 

 the treatment of pneumonia. J., Straight, 4 system 

 of leather straps used to bind violently insane persons 

 in order to prevent self-inflicted injury. 



Jackson's Pectoral Syrup. A cough-medicine contain- 

 ing morphin hydrochlorate, sugar, sassafras pith, gum 

 arabic, and water. 



Jacksonian Epilepsy. Focal, cortical, or symptomatic 

 epilepsy. A spasm limited to a single group of muscles 

 in the face, arm, or leg, due generally to irritative lesion 

 of the motor area of the brain ; the spasm may also in- 

 volve other groups of muscles ; consciousness is usually 



retained ; there is danger of the convulsions becoming 

 general. See Epilepsy, and Diseases, 'Table of. 



Jacob's Membrane. A name sometimes applied to 

 the layer of rods and cones of the retina. J.'s Ulcer. 

 See Rodent Ulcer, and Diseases, Tall 



Jacobson's Anastomosis. The tympanic plexus. See 

 Plexus. J.'s Canal. See Canal. J.'s Caitilage, 

 a strip of cartilage under Jacobson's organ, firmly 

 adherent to the latter, but distinct from the septal 

 cartilage of the nose, to the outer side of the ventral 

 edge of which it is situated. J.'s Nerve, the nerve 

 of the tympanum. See Nerves, Table of. J.'s Organ, 

 a short, rudimentary canal, extending along the septum 

 of Stensen's duct, and ending in a cul-de-sac. 



Plaster Jacket. (Sayre.) 



Jacquart, Angle of. See Angle. 



Jacquemin's Sign. See Signs and Symptoms, Table of. 

 Jactation (jai-ta'-sAun). See Jactitation . 

 Jactitation { jak-tit-a' -shun) [ jactitare, to pour forth]. 

 The restlessness and tendency to frequent changes of 



