CHEMOTACTIC 



286 



CHIBRET'S OPERATION 



Chemotactic {kem-o-tak' '-tik) \_xriyxm, chemistry ; 

 rat-ir, battle-array]. Pertaining or relating to chem- 

 otaxis. 



Chemotaxis (kem-o-taks 1 '-is) , Chemiotaxis (kem-e-o- 

 taks'-is) \j(rinzia, chemistry ; raaaecv, to order, arrange]. 

 The property of cellular attraction and repulsion. It 

 is displayed by the proteid constituents of the proto- 

 plasm of various species of bacteria, as well as by 

 proteids from a great variety of sources. The quali- 

 fications positive and negative are added according as 

 the phenomenon is one of attraction or repulsion. 



Chemotic (ke-mof '-ik) [^//wcrif, a gaping] . Pertaining 

 to or marked by chemosis. 



Chemotropism (kem-of -ro-pizm) [j^/zcm, chemistry ; 

 rpoiTT/, a turning, a rout, a putting to flight]. In 

 biology, the destruction of bacteria by phagocytes ; the 

 victory of the phagocytes over bacteria, or of bacteria 

 over phagocytes. In biology, the attraction of leu- 

 kocytes by certain chemic substances held in solution 

 in the blood, either positive or negative. Cf. Chemo- 

 taxis. 



Chenopodium (kcn-o-po f -de-um) \_xvv, a goose ; tt66lov, 

 a little foot]. American Wormseed; the fruit of C. 

 ambrosioldes, or anthelminticum , a plant native to the 

 United States with properties due to a volatile oil, 

 which is the only preparation used. It is a mild car- 

 diac stimulant, promoting the secretions of the skin 

 and kidneys, and also a very efficient anthelmintic 

 against the round- worm. Dose of the oil n\,v-xv. 



Cheoplastic [ke-o-plas'-tik) \_x&uv, to pour; wXaariKdg, 

 plastic]. Made soft and yielding by heat. C. Metal, 

 an alloy composed of tin, silver, and bismuth, with a 

 small trace of antimony. 



Cherry (cher'-e) [ME., chery~\. The bark of the com- 

 mon cherry, Prunus serotina, a mild bitter and tonic, 

 containing tannin. Dose of fid. ext. ^ss-j. Prunin, 

 a concentrated ext. Dosegr. j-iij. C. -Compound, 

 each Oj represents cherry-bark ^ viij, lettuce ,:§iij, 

 horehound ^ iijss, bloodroot 3;j, veratrum viride ^ss. 

 Dose tt\xv- 5 j . All unof. See also Choke-cherry and 

 Prunus virginiana. C. -laurel, the European ever- 

 green cherry, Prunus lauro-cerasus. Water distilled 

 from its leaves is used in the same way as dilute hy- 

 drocyanic acid. See Acid, Hydrocyanic. 



Cheselden's Operations. See Operations, Table of. 



Chest. See Thorax. C, Barrel-, a peculiar formation 

 of the chest observed in cases of long-standing em- 

 physema of the lungs ; it is round like a barrel, and 

 in respiration is lifted vertically instead of being 

 expanded laterally. See Emphysema. C. -founder. 

 See Founder. C. Sweetbread. See Sweetbread. 



Chestnut. See Castanea. C. Extract. See Horse- 

 chestnut-bark. C.-wood, a wood used in leather- 

 manufactures, derived from the Castanea vesca, and 

 containing from eight to ten per cent, of a tannin 

 that closely resembles gallotannic acid. The extract, 

 containing from 14 to 20 per cent, of tannin, is 

 used largely to modify the color produced by hem- 

 lock extract arid for tanning and dyeing. 



Chevreul's Test. See Tests, Table of. 



Chevron-bone (shev'-ron-bon) [_Mh., capro, a rafter; 

 boon, bone]. One of two bones forming a V-shaped 

 arch beneath the caudal portion -of the back-bone of 

 many animals. 



Chewstick [ME., chewen, to chew ; stiken, to pierce]. 

 The bark of Gonania domingensis, a popular aro- 

 matic bitter in the West Indies. It is also used as a 

 dentifrice and masticatory. Dose of the fld. ext. 

 jjj-ij. Unof. 



Cheyne's Operation. See Operations, Table of. 



Cheyne-Stokes Breathing or Respiration. See 

 Signs and Symptoms, Table of. C. Nystagmus, a 



variety of nystagmus in which the oscillations of the 



Tracing of Cheyne-Stokes Breathing. 



eyeball have a rhythmic variation similar to the rhythm 



of Cheyne-Stokes respiration. 

 Chian {hi' -an) \_x^z, Chios]. Pertaining to Chios, an 



island in the JEgean Sea. C. Turpentine. See 



Terebintkina. 

 Chiasm, Chiasma {ki'-azm, ki-az' -mah) \_xi6C,En\ to 



make a cross, as an X]. The optic commissure. 



Optic Chiasm and Adjacent Parts. 

 1. Infundibulum. 2. Tuber cinereum. 3. Corpora albicantia, 

 or mammillaria. 4. Crus cerebri. 5. Pons varolii. 6. Middle 

 cerebellar peduncle. 7. Anterior pyramid. 8. Decussation. 

 9. Olivary body. 10. Gray tubercle of Rolando. 11. Aici- 

 form fibers. 12. Superior extremity of spinal cord. 

 Denticulate ligament. 14. Spinal dura mater. 15. Optic 

 tract. 16. Optic chiasm. 17. 3d nerve. 18. 4th nerve. 

 19. 5th nerve. 20. 6th nerve. 21. Facial nerve. 22. Audi- 

 tory nerve. 23. Nerve of Wrisberg. 24. Glosso-pliuiyn- 

 geal nerve. 25. Pneumognstric nerve 26, 26 Spinal 

 accessory nerve. 27. Hypoglossal. 28 1st cervical pair. 

 29. 2d cervical pair. 30. 3d cervical pair. 



Chiastometer (ki-as-tom'-ct-er) [^oitt^c, crossed;, 

 ftirpov, a measure]. An instrument for measuring 

 any deviation of the optic axes from parallelism. 



Chibou (see-boo') [Fr.l. The resin or gum of />', 

 gummtfera, a tree of Florida and tropical America J 

 it is locally valued in diseases of the lung and kidneys, 

 and is used in various plasters and ointments ; it is 

 called also cachibou and archipin. I'nof. 



Chibret's Operation. See Operations , Table of. 



