DEGRAS 



358 



DELIRIUM 



Degras [de'-gras). See Leather. 



Degrease [de-gres') [Fr., digraisser~\. To remove fat, 

 as from bones in the preparation of skeletons. 



Degreasing [de-gres' -ing) [Fr., degraisser~\. Removing 

 the fat, as from bones. 



Degree [de-gre') [de, from ; gradus, a step]. Position 

 in a graded series ; quality. The units or intervals of 

 thermometric scales. Also, a charter or testimonial 

 of qualification granted by a medical or other college. 

 In trigonometry the «4g part of the arc of a circle. 



Degut [de-gut') [Russ.]. Birch oil or tar. See Birch. 



Dehio's Method. A method of outlining the stomach. 

 About a quart of water is introduced in separate quan- 

 tities of a half-pint each, and after the ingestion of each 

 portion, the lower crescentic limit of flatness against 

 the tympanitic transverse colon is outlined. The 

 normal stomach with this additional weight will not 

 quite reach the level of the umbilicus, while in case 

 of dilatation its descent will be rapid and considerable. 



Dehisce [de-his') [de, off; hiscere, to gape]. In bi- 

 ology, to split open. Applied to the splitting open of 

 anthers to shed their pollen, of antheridia to set free 

 their antherozoids, of sporangia to shed their spores, 

 of certain fruits to shed their seeds, etc. 



Dehiscence [de-his' -ens) [de, off; hiscere, to gape or 

 yawn]. In biology, the act of dehiscing or splitting 

 open. 



Dehorn [de, away from; ME., horn\. To deprive 

 cattle of their horns. 



Dehumanization [de-hu-man-iz-a' '-shun) [de, from ; 

 humanus, human]. I. The loss of the proper char- 

 acteristics of humanity, either by insane persons, or 

 by debased criminals. 2. The supposed loss of some 

 quality pertaining to the human species ; as in the 

 alleged dehumanization of vaccine virus. 



Dehydration [de-hi-dra' -shun) [de, away from ; iidup 

 [i/Sp-), water]. The necessary removal of water from 

 microscopic preparations previously to clearing and 

 mounting in balsam. Absolute alcohol is generally 

 best ; anilin is used in special cases in which alcohol 

 is inadmissible. 96 per cent, alcohol will answer if 

 xylol or cedar oil be used as the clearing-agent, and 

 should always be used with celloidin sections. It is 

 also called Anhydration. 



Deiters' Cells. Certain cellular structures between the 

 outer hair-cells of the organ of Corti. Also certain 

 nucleated cells at the intersection of the fibers of the 

 white substance of nerves. Deiters' Cells (spider- 

 cells) are also found in the neuroglia, especially in that 

 of diseased brain-tissue. D. Nucleus, a nucleus lying 

 in the direct sensory cerebellar tract of the medulla 

 oblongata. Its function is unknown. See Nucleus 

 magno-cellularis. D. Process, the process of a nerve- 

 cell, that goes to form an axis-cylinder. 



Dejection [de jek' '-shun) [dejectio: de, down; jacere, 

 to throw]. The discharge of fecal or other excremen- 

 titious matter; the matter so discharged. Also, a 

 state of despondency. 



Dejectiones nigrae [de-jek-she-o' -nez ni'gre) [L.]. 

 Synonym of Melena. 



Dekagram [dek'-a-gram). See Decagram. 



Dekaliter (dek'-a-le-ter). See Decaliter. 



Dekameter [dek'-a-me-ter). See Decameter. 



Del Toro's Operation. See Operations, Table of. 



Delafield's Hematoxylin. See Hematoxylin and Stains. 



Delagarde's Operation. See Operations, Table of. 



Delamination [de-lam-in-a' -shun) [de, away ; lamina, 

 a thin metal plate]. In biology, applied to the split- 

 ting of the blastoderm into two layers. 



Dela Rue's Method. A method of preparing carminic 

 acid. Exhaust cochineal in boiling water. Precipi- 

 tate the extract with plumbic acetate slightly acidulated 



with acetic acid, care being taken not to add an excess 

 of the lead. Wash the precipitate with distilled water 

 until the wash-water ceases to give a precipitate with 

 mercuric chlorid; then decompose it with hydrogen 

 sulphid ; filter, evaporate the filtrate to a syrupy con- 

 sistence on a water-bath, and dry ; extract the dark- 

 purple product with alcohol, which dissolves out the 

 carminic acid. See Stains, Table of. 



Delayed Symptoms. A term used as a synonym of 

 Shock, Deferred, q. v. 



Deleterious [del-et-e'-re-us) [dyXyTT/pior, hurtful]. Hurt- 

 ful, injurious. 



Delffs' Tests. See Tests, Table of . 



Delhi Boil {del' -he boil). See Furunculus orientalis. 



Delicate [del'-ik-at) [delicatus, delicate]. Of a refined 

 constitution. Feeble. In a condition of poor health. 



Deligation [del-ig-a' '-shun) \_deligatio, a binding]. Li- 

 gation, as of an artery; bandaging, as of a wound. 



De Lignerolle's Operation. See Operations, Table 



°f: 



Deliquescence [del-ik-zves' -ens) [dehquescere, to melt 

 away]. The breaking down as a result of the ab- 

 sorption of water from the atmosphere, characteristic 

 of certain substances. Such substances are said to be 

 hygroscopic. 



Deliquescent [del-ik-wes' '-ent) [deliquescere, to melt 

 away]. In biology, dissolving ; applied to a stem that 

 divides into branches. 



Deliquium [dclnk' -we-utn) [L.]. An absence. D. 

 animi. 1. Failure of the mind; mental decay ; melan- 

 choly; lownessof the spirits. 2. Syncope or fainting. 



Delirament [de-lir' '-am-ent) [deliramentum, delirium]. 

 Delirium. 



Deliration [de-lir-a' -shun) [Deliratio, delirium]. De- 

 lirium. 



Deliriant [de-lir' '-e-ant) \_de, out of; lira, the furrow]. 

 An agent that acts on the brain, so as to disorder the 

 mental faculties and produce confusion of will-power. 



Delirifacient [de-lir-e-fa' -she-ent) [delirium, delirium; 

 facere, to make] . Producing delirium. 



Delirious [de-lir' '-e-us) [delirus, mad, raving]. Af- 

 fected with delirium ; wandering in mind. 



Delirium [de-lir' -e-um) [delirium, madness]. A dis- 

 turbance of the cerebral functions manifested by im 

 paired action of the nerve-centers, characterized by 

 hallucinations, an incoherence of speech, a stag^ 

 gait, etc. D., Alcoholic. See D. tremens. D. 

 ambitiosum, a condition of boastfulness that is some 

 times manifest in the course of paretic dementia. D. 

 cordis, a peculiar condition of the myocardium re 

 suiting when chloroform vapor is administered 

 a certain point of concentration. The myocardium 

 fails to contract and rapidly becomes insensiti 

 stimulation, being thrown only into fibrillary contrai 

 tion. A heart once so dilated beyond the point ol it- 

 ability to re-contract never recovers, and death 1 

 D. ebrositatis. See D. tremens. D., Febrile, 

 the delirium of fever. D. furibundum, acute ma 

 nia. D. of Grandeur, delirium ambitiosum. D. 

 mussitans, low, muttering delirium. D. nervosum, 

 the delirium following severe surgical operatioi 

 injuries. D. palignosticum, that in which the ■ 

 tient asserts that he has been before in a 

 which he has come for the first time. D. per 

 tionis, that in which the patient imagines Inmsrl. 

 the object of persecution. D. potatorum, sym 

 of D. tremens. D., Senile, the delirium ol 

 dotage. D., Toxic, the delirium caused by p 

 D. tremens, the delirium arising from alcoholic ppu 

 oning, and usually following some acute sukne 

 overwork, or the shock consequent upon an injnrj 

 or surgical operation. It is characterized by coi 



