EVULSION 



449 



EXCITATION 



essary condition, and therefore themselves not called 

 factors, are two opposite operative principles, viz., 

 heredity and variability. Like the conservative and 

 progressive elements in society, one tends to fixedness, 

 the other to change. The one initiates change, the 

 other accumulates its effects in successive generations. 

 The one tries all things, the other holds fast to what- 

 ever is good. They are both equally necessary to the 

 successful operation of any or all of the factors. E., 

 Ontogenetic, the development of an embryo from an 

 egg. E., Phylogenetic, the evolution of species. E., 

 Spontaneous, a term expressive of the unaided oc- 

 currence in childbirth of a series of changes, whereby 

 a shoulder-presentation is transformed within the pel- 

 vis into a combined breech-and-shoulder-presentation 

 and delivery effected. 



Evulsion [e-vul' -shun) [evulsio ; eiellere , to pluck out]. 

 The forcible tearing or plucking away of a part, as a 

 polypus, tonsil, etc. 



Ewald's Test-breakfast. A method used in ascertain- 

 ing the condition of the gastric juice. It consists of 

 35 to 70 grams of white bread and 300 cm. of water, 

 or a cup of weak tea without milk or sugar. 



Ewald and Boas's Method. A method of removing the 

 contents of the stomach. It is carried out by causing 

 the patient to make forcible voluntary contraction of 

 the abdominal muscles, steady pressure being applied 

 to the epigastrium. 



Exacerbation (eks-as-er-ba f -shun) [exacerbatio ; exac- 

 erbare, to be violent]. Increased or paroxysmal 

 violence of the symptoms of a disease. 



Exaggerated [eks-af -er-a-ted) [exaggerare, to heap up]. 

 Larger ; more marked ; increased. E. Breathing. 

 See Breath-sounds. E. Lithotomic Posture. See 

 Postures, Table of . 



Exalbuminous (eks-al-bu' -min-us) [ex, priv. ; albumen, 

 the white of an egg, from albus, white]. In biology, 

 applied to seeds in which the nutritive matter, endo- 

 sperm or albumin, is stored within the embryo. 



Exalgin (eks-al' -jin) [if, out; a/.yoc, pain], C 9 H n NO. 

 Methylacetanilid ; a benzene derivative allied to phen- 

 acetin. It is a valuable analgesic and antipyretic in 

 doses of one-half to four grains. Unof. 



Exalt (eks-awlf) [exaltare, to lift up; exalt]. In 

 chemistry, to purify or refine. 



Exaltation (eks-awl-ta' '-shun) [exaltatio, an uplifting]. 

 I. Increase of functional activity. 2. Increase of 

 mental activity. 3. A morbid mental state char- 

 acterized by self-satisfaction, ecstatic joy, abnormal 

 cheerfulness, or optimism, or by delusions of 

 grandeur. 



Examination (eks-am-in-a' '-shun) [examinare, to exam- 

 ine]. Investigation, as for the purpose of diagnosis ; 

 it is variously qualified as bimanual, digital, oral, 

 physical, etc. 



Exangia, or Exangeia (eks-an-je* '-ah) [if, out ; ayyeiov, 

 vessel]. Any dilatation or distention of a blood-vessel, 

 such as aneurysm, varix, or capillary enlargement. 



Exanimation (eks-an im-a'-shun) [ex, out ; anima, 

 spirit]. Real or apparent death ; fainting. 



Exannulate (eks-an' -u-ldt) [ex, priv ; annulus, a ring] . 

 In biology, applied to ferns, the sporangium of which 

 lacks the annulus. 



Exanthema, or Exanthem {eks-an' -them- ah, or eks f - 

 an-them) [igav&r/fia, eruption: //. , Exanthemata]. I. 

 An eruption upon the skin. 2. Any exanthematous or 

 eruptive fever. 3. In biology, any irregular spot on 

 the surface of a leaf or other organ. A Table of the 

 Exanthemata is appended on page 450. E., Syph- 

 ilitic. See Roseola, Syphilitic. 

 Exanthematic (eks-an-them-af -ik). See Exanthema- 

 tous. E. Typhus. See Typhus Fever. 

 29 



Exanthematology (eks-an-them-at-oV '-o-je) [igavdijfia, 

 eruption; 7j6yoc, science]. The science of the ex- 

 anthematous diseases. 



Exanthematous (eks-an-them' -al-us) [kl-avdripa, erup- 

 tion]. Of the nature of or characterized by exanthema, 

 or eruption ; of the nature of an eruptive fever. 



Exanthesis (eks-an-the / -sis) [ifavftytwc, a blossoming : 

 pi., Exaiithi'ses~\. I. The breaking out or the appear- 

 ance of an exanthem. 2. Any exanthematous dis- 

 ease. E. rosalia arthrodynia. Synonym of Den- 

 gue. 



Exanthropia (eks-an-thro* -pe-ah) [if, out ; avdpo—oc, 

 men]. Morbid dislike of human society ; apan- 

 thropia. 



Exarteritis (eks-ar-ter-i' -tis) [if, out; aprijpia, artery; 

 trig, inflammation]. Inflammation of the outer coat 

 of an artery. 



Exarthrima (eks-ar-thrim' '-ah) [if, out ; apdpov, joint : 

 //., Exarthrimata~\. Luxation or dislocation of a 

 joint. 



Exarticulate (eks-ar-tik / -u-ldt) [ex, priv. ; articulare, 

 to join]. In biology, applied to limbs, antennae, 

 palpi, or other appendages destitute of joints. 



Exarticulation (eks-ar-tik-u-la' -shun) [ex, out ; articu- 

 lus, joint]. I. Luxation of a joint. 2. Amputation 

 at a joint. 



Excandescentia (ex-kan-des-en f -she-ah) [ex, out ; can- 

 descere, to glow]. Angry or furious mania ; a parox- 

 ysm of insane fury. 



Excarnation (eks-kar-na' -shun) [ex, out; caro, flesh]. 

 The removal of superfluous tissue from an anatomic 

 preparation. 



Excaudate (eks-kauS-ddt) [ex, priv. ; cauda, tail]. In 

 biology, tailless. 



Excavation (eks-kav-a'-shun) [excavare, to hollow 

 out]. A hollow or cavity, as in the lungs or in a 

 tissue. E. of the Optic Nerve, a hollowing or 

 " cupping" of the disc, or optic nerve-entrance, that 

 may be physiologic or congenital, and without par- 

 ticular significance ; or pathologic, the result of glau- 

 coma, optic atrophy, etc. 



Excavator (eks' ' -kav-a-tor) [excavare, to hollow out]. 

 A dental instrument for opening and forming cavities 

 and removing decayed matter from them ; e. g., the 

 hatchet, hoe, and chisel. 



Excentric (eks-sen'-trik) [ex, out ; centrum, center]. 

 I. See Eccentric. 2. Out of the center or median 

 line. E. Pains, radiating pains, symptomatic of 

 spinal disease, due to irritation of the posterior nerve- 

 roots. The pains are felt to be in the peripheral 

 organs, hence the name. 



Excerebration (eks-ser-e-bra' -shun) [ex,o\A; cerebrum, 

 brain]. The removal of the fetal brain in the process 

 of embryotomy. 



Excipient (ek-sip' -e-ent) [excipere, to take up]. In 

 pharmacy, any substance used to give an agreeable or 

 convenient form to the ingredients of a prescription. 



Exciple (ek'-sip-l) [excipmlum, a receiving- vessel]. 

 That part of a lichen forming the rim of the perithe- 

 cium, or immediately surrounding it. 



Excision (ek-sizh' -un) [excisio, a cutting out]. The 

 operation of removing a part or tissue by cutting ; a 

 cutting out. 



Excitability (ek-stt-ab-il'-it-e) [excitare, to rouse]. The 

 property of reacting to stimulus. 



Excitant (ek-si' -tant) [excitare, to rouse]. A remedy 

 that stimulates the activity of an organ. 



Excitation (ek-si-ta' -shun) [excitare, to rouse]. The 

 act of stimulating or irritating. E., Direct, in electro- 

 therapeutics, the excitement of a muscle by placing 

 an electrode on the muscle itself. E., Indirect, the 

 excitement of a muscle through its nerve. 



