HETEROPHYLLOUS 



566 



HEXANE 



Heterophyllous^^-fr-i^ 7 -?'/-^) [erepoc, other, different; 

 yvXkov, leaf]. In biology, producing more than one 

 kind of leaves on the same stem, as mjuniperus sabina, 

 var. procumbens, or having the leaves different in the 

 several species of a genus. 



Heteroplasia (het-er-o-pla 1 '-ze-ah) [ercpoc; ; other; iz/Aacg, 

 shaping]. I. Development of abnormal tissue; the 

 presence in a part where it does not normally belong, 

 of tissue that may, or may not, be normal. 2. The 

 gradual removal of the material of an engrafted part, 

 and its replacement by material normal to the part in 

 which it is engrafted. 



Heteroplasm (het r -er-o-plazm) [erepoc, other; nAaa/ia, 

 something formed]. Heteroplastic material. 



Heteroplastic (het-er-o-plas' -tik) [erepoc, other; 

 nMoaeiv, to form]. I. Relating to heteroplasia. 2. 

 Differing in structure. 



Heteroplastid (het-er-o-plas / -tid ) [erepjg, other; 

 TiTidaaeiv, to form]. A surgical graft. 



Heteroplasty (hef '-er-oplas-te) [krepoq, other; Tr/Acoetv, 

 to form]. I and 2. Same as Heteroplasia, q. v. 3. 

 Surgical grafting, especially of parts taken from another 

 species. 



Heteroprosopus (het-er-o-pro-so' -pus) [erepoc, other ; 

 TrpdouTTnv, face]. A fetus with two faces; janus or 

 janiceps. 



Heteropsychology (het-er-o-si-kol' -o-je) \zrzpor, other ; 

 ipvxij, soul ; Aoyoc, treatise]. The study or science 

 of psychology, as based upon facts other than those of 

 one's own subjective experiences. 



Heteropterous (het-er-op' -ter-us) [erepoc, other, differ- 

 ent; nrepdv, wing]. In biology, having the wings 

 composed of several distinct parts, as in the bugs. 



Heterorexia (het-er-o-reks' -e-ak) [erjpof , other ; bpeS-iq, 

 desire]. Perversion of the appetite. 



Heteroscopy (Jiet-er-os f -ko-pe) [erepoc, other ; onorrelv, 

 to examine]. Same as Deuteroscopy. 



Heterosomatous (het-er-o-som'-at-us) [jtrepoi;, other, 

 different; ao)/na, body]. In biology, having the body 

 bilaterally asymmetric, or otherwise varying from a type. 



Heterosporous (het-er-os' -po-rus) \irepoc, other, differ- 

 ent ; aivdpog, seed]. In biology, bearing spores of 

 more than one kind, as macrospores and tJiicrospores. 



Heterostrophy (het-er-os' -tro-fe) [erepoc, other, differ- 

 ent ; a-po<pr/, a turning]. In biology, a reversal in the 

 direction of the twist, as in certain spiral shells. 



Heterostyled (het'-er-o-stlld) [erepoc, different ; a-vAoc, 

 a pillar, style]. See Heterogonous. 



Heterotaxia (het-er-o-taks'-e-ah). See Heterotaxis. 



Heterotaxis (het-er-o- tales' '-is) [erepoc, other ; ragic, or- 

 der]. The anomalous disposition or transposition of 

 internal organs ; a form of malformation occasionally 

 seen in the human species — situs inversus viscerum. 

 The transposition is most commonly seen in the abdo- 

 men. There is no interference with nutrition or func- 

 tion by the abnormal arrangement of the parts. The 

 opposite of Homotaxis . 



Heterotopia (het-er-o-to'-pe-ah) [erepoc, other; totvoq, 

 place]. I. Any misplacement of normal tissue, 

 especially a congenital malformation of the brain, in 

 which masses of gray matter are found transplanted 

 into the white. This condition is invariably associated 

 with idiocy. 2. The same as Heterochronia. 3. In 

 biology, a mode of acceleration or change during 

 growth, characterized by the transfer of cells from one 

 part of the organism to the other. 



Heterotopic (het-er-o-top'-ik). See Heterotopous. 



Heterotopous (het-er-of '-o-pus) [erepoc, other ; t6tzoc, 

 place]. Characterized by heterotopia ; misplaced. 



Heterotopy (het-er-of -o-pe). Same as Heterotopia. 



Heterotrophia, or Heterotrophy (het-er-o-tro' -fe-ah, 

 or het-er-of '-ro-fe) [erepoc, other ; Tpo<pr/, sustenance]. 



Any perversion or disorder of nutrition, local or 

 general. In biology, obtaining nourishment by some 

 abnormal or unusual arrangement. 



Heterotropia (het-er-o-trop'-e-ah). See Strabismus. 



Heterotopic (het-er-o-trop' -ik) [^erepog, other, different ; 

 rpdnoq, a turning]. In biology, applied to plants the 

 different organs of which behave differently under the 

 same form of irritation. Cf. Anisotropic. 



Heterotropous (het-er-of '-ro-pus) ^erepog, different ; 

 rpdnoq, turning]. In biology, applied to any organ or 

 part which is turned in an unusual direction, as an 

 embryo transverse to the axis of the seed ; amphitro- 

 pous. 



Heterotypic (het-er-o-tip' '-ik) , Heterotypical (het-er-o- 

 tip' -ik-al) [erepoc, other; Tvtrvr, pattern]. Applied 

 to a monstrosity consisting of a well-developed fetus 

 from which grows an immature secondary fetus. 



Heterotypus (het-er-o-ti' -pus) [^erepoc, different ; tvttoc, 

 a type]. A double monster having the parasitic 

 fetus hanging from the ventral wall of the principal 

 subject. 



Heteroxanthin (het-er-o-zan'-thin) [erepor, other; 

 i-avddq, yellow], C 6 H 6 N 4 2 . A leukomaine isolated 

 from urine in 1884. In composition it is methyl-xan- 

 thin, and it is intermediate between xanthin and para- 

 xanthin or dimethyl-xanthin ; it exists in the urine of 

 man in the same proportion aspara-xanthin. It occurs 

 in larger amount in the urine of leukemic patients. 

 It is crystalline, soluble in hot water, insoluble in 

 alcohol and ether. It is thought by Solomon to have 

 its origin in the kidney. Its physiologic action is not 

 yet fully known. Xanthin, heteroxanthin, and para- 

 xanthin form normally an homologous series of xan- 

 thin-bodies in the urine. 



Heubner's Disease. Syphilitic disease of the cerebral 

 arteries. See Diseases, Table of. 



Heuchera (hu'-ker-ah). See Alum-root. 



Heurteloup (her' '-tel-tlp) [after Baron Heurteloup, the 

 inventor]. An artificial leech or cupping-apparatus. 



Hewitt's Mixture. A mixture used in treating chlo- 

 rosis. It consists of compound spirit of ether, com- 

 pound tincture of lavender, and aromatic spirit of 

 ammonia, each 2 drams ; water sufficient to make 2 

 ounces. Of this one dram is given every two or three 

 hours. 



Hewson's Dressing. An application for wounds, 

 tumors, etc., consisting of dry earth containing about 

 50 per cent, of clay. H.'s Experiments, experi- 

 ments made to prove that the blood-vessels exert a 

 restraining influence on coagulation. 



Hexabasic (heks-ah-ba'-sik) [ef, six; [iaoic, a base]. 

 Replaceable by six basic atoms. 



Hexactinal (heks-ak' '-tin-al) [e£, six; auric;, ray]. In 

 biology, bearing six rays. 



Hexad (heks'-ad) \£$dc, six]. In chemistry, an 

 element the atoms of which have six times the saturat- 

 ing power or equivalence of the hydrogen atom. 



Hexadactylism (heks-ad-ak' -tilizm) [e£ric, six ; ddnrv- 

 log, a finger]. Having six fingers or toes. 



Hexagynian (heks-aj-in' -e-ati) [ef, six; ytw), female]. 

 In biology, having six pistils or styles. 



Hexahydric Alcohols (heks-ah-hi'-drik). See Alco- 

 hol. 



Hexamerous (heks-am'-er-us) [ef, six ; frfpor, part]. 

 In biology, having six parts, or the parts in sixes. 



Hexandrous (heks-an'-drus) [ef, six ; dvi/p, male]. In 

 biology, having six stamens. It is also called // 

 drious, Hexandriau. 



Hexane (heks f -an) [efdc, six] , C„H U . The sixth mem- 

 ber of the paraffin series of hydrocarbons. It is a 

 liquid, boiling at about 7I°C. , found in various natural 

 oils. 



