HOMOTONIC 



574 



HORIZONTAL 



Homotonic (ho-mo-ton' '-ik\ [6/i6g , same ; rdvog, tone, 

 tension] . Having a uniform or even course ; ap- 

 plied to diseases. 



Homotopia {ho-mo-to' '-pe-ah) . See Homotopy. 



Homotopy {ho-mot' -o-pe) \_6p.6g, the same; tSttoc, 

 place]. In biology, the usual or normal mode of 

 acceleration or change of parts during growth, 

 characterized by the exact or modified repetition or 

 multiplication of cells or segments already present; 

 also called repetition. Autonym of Heterotopy. 



Homotropal {ho-mof -ro-pal) . Same as Homotropous. 



Homotrophe ,(ho> ' -mo-trbf) \pp-6g, the same; rpo<pij, 

 nourishment]. In biology, one of two or more 

 homologous parts or organs the structural correspond- 

 ences of which are due to corresponding internal, 

 modifying conditions, rather than to external environ- 

 ment. I. Serial Homotrophes, i. e., homotrophic 

 homologues, the correspondence between which is 

 anteroposterior, e.g., an extra thumb and an extra 

 great toe on the same side of the body. 2. Ver- 

 tical Homotrophes, i. e., homotrophic homologues 

 that correspond vertically. 3. Lateral Homo- 

 trophes, i. e., homotrophic homologues of the two 

 sides of one individual, e. g. , the right and left eyes. 

 4. Antero-posterior Homotrophes, i. e., homo- 

 trophic homologues that correspond antero-posteriorly. 

 (St. Geo. Mivart.) 



Homotrophic {ho-mo-trof '-ik) \_6p6g, the same; rpotyf], 

 nourishment]. In biology, exhibiting homotrophy. 

 Homotrophic Homologues, i. e., parts of an 

 individual, the correspondences between which are 

 regarded as due to internal modifying influences, e.g., 

 the eyes and the ears. 



Homotrophy {ho-mot' -ro-fe) \_6p.6g, the same ; Tpofyrj, 

 nourishment]. In biology, correlations of growth; 

 homoplasy due to internal conditions rather than ex- 

 ternal environment. 



Homotropous {ho-mof -ro-ptis) \_bfil>g, the same ; Tp6irog, 

 turn]. In botany, said of the embryo when curved 

 the same as the seed containing it. 



Homotype {ho' '-mo-tip) [o^df, same ; tvtvoq, a pattern]. 

 A part corresponding and similar to another part, as 

 the humerus to the femur, a serial homologue, or an 

 antitype. 



Homotypic [ho- mo-tip' -ik) [djidg, the same ; tvtzoq, 

 type]. In biology, showing serial correspondence or 

 bilateral symmetry. 



Homotypical {ho-mo-tip' '-ik-al). Same as Homotypic. 



Homotypy {ho' '-mo-ti-pe) [ouorvnia, sameness of form]. 

 In biology, serial or bilateral homology. 



Homunculus {ho-mun'-ku-lus) [L., dim. of homo, 

 man]. The fetus; a dwarf. 



Honduras Bark {hon-du'-ras bark). See Cascara 

 amarga. 



Honey (hun'-e) [ME., kony, honey]. See Mel. H.- 

 berry. See Celtis. H.-comb, the waxy structure 

 formed by bees as a repository for the honey that they 

 produce. H.-comb Glands. See Gland. H.- 

 comb Ringworm. See Favus. H.-cyst. See 

 Meliceris. H.-dew, a glutinous liquid exuded by 

 aphides, and frequently to be noticed covering the 

 leaves of the bass-wood, sycamore, oak, maple, plum, 

 apple, box, currant, etc. Its taste is mawkish, its 

 odor unpleasant, and its color often as dark as molas- 

 ses, especially that found in the oak and sycamore. 

 H. -stone. See Mellitic Acid. 



Honorarium {on-or-a' -re-um) [L.]. A professional 

 fee ; especially one that is in theory a gift, no formal 

 professional charge having been made. 



Hoof [hoof) [ME., hoof, a hoof]. The casing of hard, 

 horny substance that sheathes the ends of the digits or 

 incases the foot in many animals. H. -bound, in far- 



riery, having a dryness and contraction of the hoof, 

 resulting in pain and lameness. This condition is 

 also called Contracted Heels. 



Hook [ME., hok, a hook] A curved instrument. See 

 Hamus. H., Blunt, an instrument described by its 

 name, for exercising traction upon the fetus in an ar- 

 rested breech-presentation. H., Tyrrel's, a blunt, 

 slender hook lor operations upon the eye. 



Hooke's Law. See Law. 



Hooper's Pill. A pill containing aloes, crystallized 

 sulphate of iron, extract of hellebore, myrrh, soap, 

 canella, and ginger. 



Hooping-cough {hoop' -ing-kawf). See Pertussis. 



Hoose {hooz) [ME., hose, hoarse]. Sheep-cough. A 

 disease of sheep, lambs, etc., due to the presence of 

 Strongylus filar ia, a nematode worm, in the lungs and 

 air- passages (see under Parasites, Animal), and 

 characterized by a husky cough, anorexia, dry muzzle, 

 constipation, and dyspnea. 



Hoove, Hooven (hoov, hoov'-en) [dial., hooven~]. Dis- 

 tention of the stomach of a ruminant animal with 

 gas, caused by the fermentation of food. It is gen- 

 erally due to eating too much green food. 



Hop. See Hamulus. 



Hope's Camphor-mixture. A mixture containing nitric 

 acid, camphor- water, and tincture of opium. It is 

 used in the treatment of serous or choleraic diarrheas. 



Hopea {ho-pe'-ah) [after John Hope, a Scotch botanist]. 

 A genus of dipterocarpaceous trees of S. Asia. 

 Several species afford resins known in commerce as 

 Dammar. Unof. 



Hopein {ho-pe' -in). See Humulus. 



Hoppe-Seyler's Method. A method of preparing 

 hemoglobin crystals. Mix defibrinated blood with ten 

 volumes of a 20 per cent, salt-solution, and allow it 

 to stand for two days. Remove the clear upper fluid 

 with a pipet, wash the thick deposit of blood-cor- 

 puscles with water, and shake it for a long time with 

 an equal volume of ether, which dissolves the blood- 

 corpuscles. Remove the ether, filter the lake-colored 

 blood, add to it one-fourth of its volume of cold 

 alcohol (o°C.) and allow the mixture to stand in the 

 cold for several days. The crystals can be collected 

 on a filter and pressed between folds of bibulous paper. 



Hordeiform {hor-de'-iform) \J10rdeum, barley ; forma, 

 form]. Shaped like a grain of barley. 



Hordein {hor'-de-in) \hordeum, barley]. A mixture of 

 a proteid with starch-cellulose ; it exists in barley- 

 starch, but is not soluble. 



Hordeolum {hor-de' -o-lum) \hordeum, a grain of bar- 

 ley]. A stye ; a furuncular inflammation of the 

 connective tissue of the lids, near a hair-follicle. 

 H., External, H. zeissianum ; one produced by sup- 

 puration of one of Zeiss's glands. H., Internal, // 

 meibomianum ; one produced by suppuration of one 

 of the Meibomian glands. H. meibomianum. See 

 H., Internal. H. zeissianum. See H., External. 



Hordeum {hor'-de-um) [L.]. Barley, q. v. H. 

 decorticatum, barley deprived of its husk ; com- 

 monly called pearl barley. H. germinatum, malt. 

 Also, one of several granular elevations described by 

 Spitzka on the floor of the fourth ventricle. 



Horehound {hor'-hcnvnd). See Marrttbittm. 



Horizon {hor-i'-zon) \_6pi[,uv, horizon]. 1. Thelinesep- 

 arating the visible from the invisible part of the earth 

 from a single point of view. 2. In craniometry, a 

 line that extends around the skull, touching the lower 

 border of the orbital cavities and passing through 

 the auricular points. 



Horizontal (hur-iz-on'-tal) \opi r uv, the horizon]. Par- 

 allel to the horizon. H. Posture. See Postures, 

 Table of. 



