SENSORY 



301 



SEXTANT 



musical note is sounded. S. plants: whose 

 leaves move when stimulated by touch or by 

 the chemical action of corrosive substances, 

 e.g. , mimosa, dionsea, &c. Pink S. plant= 

 Schrankia uncinata. 



Sensory organs. The organs of the senses of 

 hearing, seeing, tasting, smelling. 



Sensual. S. animals: v. Okeu's classification. 



Sepal, (sep'al). [Sepalum, the Latin terin.J A 

 calycine leaf. v. Calyx. 



Sepia, (se'pi-a) t [ The 

 Latin name.] l.=Cut- 

 tle-fish, v. Sepiadse. 2. 

 =Indian ink, a black 

 secretion of the Indian 

 cuttle-fish. S. colour' 

 ing matter of china= 

 Oxide of iron. 



Sepiadse, (se-pi'a-de). 

 [Sepia, q.v.] Cuttle- aaa Sepals, 



fishes, q. v. '. a sub-division of Cephalopoda, q.v. 



Sepiostaire, (se'pi-o-star)=Cuttle-bone: inter- 

 nal shell of a cuttle-fish. 



Sepoy, (se'poy). [Sepahai, the native word.] 

 A native of Hindostan employed in the 

 British army. 



Septa, (sep'ta). [The Latin word.] Radiating 

 plates of a coral cell, or any small division. 



Septane=Heptane, q.v. 



Septine = Heptine : a hydrocarbon of the 

 Acetylene series, v. Hydrocarbon. 



Septum, (sep'tura). [The Latin word.] Singu- 

 lar of septa, q.v. 



Seralbumin, (ser-al-bu'min). 

 [Serum and Albumin.] A 

 variety of Albumin, q.v. 



Seraphim. A Scotch local 

 name for pterygotus, an Old 

 Red Sandstone crustacean. 



Serein. Rain falling from a 

 cloudless sky. 



Serenitatis, (ser-S-ni-ta'tis). 

 [L. serenitas, clearness. ]= Mare Serenitatis: 

 an elliptical plain on the Moon's surface, 

 about 430 miles in diameter, supposed to 

 have been the bed of a former sea. 



Series. 1. In mathematics ; a number of 

 terms, increasing or decreasing according to 

 ""some law. 2. A group of compounds, each 

 containing the same radicle. 



Seriform. v. Altaic. 



Serous membranes. Membranes secreting a 

 serous fluid; lining the cavities of the chest, 

 lungs, &c. 



Serpens, (ser'penz). [The Latin name.]=The 

 Serpent: a large northern constellation, of 

 which Unakalkay is the chief star. 



Serpent, (ser'pent). [Serpens, the Latin name.] 

 v. Ophidia. Glass S. =Anguis ventralis. v. 

 Ophisaurus. 



Serpentarius = The Serpent-bearer = Ophiu- 

 chus, q.v. 



Serpentine, (ser / pen.-tm)=MgFeSiO 3 : i. A 

 compact amorphous rock, usually of varie- 

 gated colours, chiefly silicate of magnesium, 

 containing oxide of iron; one of the meta- 

 morphic rocks: named from the serpent-like 

 veins; also called Green Marble. 2. Ophio- 

 lite: a crystalline variety, crystallising iji 



rhombs, belonging to the Serpentine group. 

 S. group of minerals; includes serpentine, 

 talc, steatite, and kaolin; all soft and light 

 substances, which have a greasy feel: sili- 

 cates of aluminum or magnesium. 



Serpentis, (ser-pen'tis). [The Latin name.] 

 Belonging to the serpent. 



Serpents, v. Ophidia. S. e?/es=Bufonites. q.v. 



Serratula, (ser-rat'u-la). [L. serratula, little 

 saw.] = Saw-wort: an . herb belonging to 

 Asteraceae. 



Serricornes, (ser-ri-kor'nez). [L. serra, saw; 

 cornu, horn.]=Sternoxi: a family of beetles, 

 belonging to Coleoptera. 



Serryia. An African people. 



Sertularian, (ser-tu-la'ri-an). [L. sertula, a 

 garland.] Belonging to Sertularidae. 



Sertularidae, (ser-tu-lar'i-de). [Sertularia, the 

 typical genus; Gk. eidos, form.] A sub-divi- 

 sion of Hydrozoa: also called Thecaphora. 



Serum, (se'rum). [L. serum, watery.] A clear 

 liquid, of yellowish colour, one of the con- 

 stituents of coagulating blood the plasma 

 after fibrin is taken from it by the corpuscles 

 in coagulating: a compound of water, albu- 

 men, and various salts. 



Service-tree=Pyrus torminalis. 



Seselinese, (ses-e-li'ne-e). A sub-division of 

 Umbelliferse. 



Sesleria, (ses-le'ri-a). [Sig. Sesler, an Italian 

 botanist.] Moor-grass: a plant belonging to 

 Graininaceae. 



Sesqui, (ses'kwi). [The Latin word.] A pre- 

 fix implying a combination of two chemical 

 elements in the ratio of 2 to 3: as Fe 2 S 3 . 



Sesqui-oxides. Of the type HgOs: in which 

 two atoms of a metal combine with three 

 atoms of oxygen. 



Sessile, (ses'sil). [L. sedo, I sit.] Having 

 no stalk. S. cirripedesBalKnidBi. S. leaf: 

 one having no stalk. 



Seta, (se'ta). [L. seta, bristle.] Any stiff 

 hair-like process. 



Setaceous, (se-ta'she-us). [Seta, q.v.] Bristle- 

 like. 



Setae, (se't5). [Seta, q.v.] Bristles. 



Setigerous, (se-tij'er-us). [L. setce, bristles; 

 gero, I carry.] Having bristles: used especi- 

 ally of some locomotive Annelidae. 



Setter, (set'er). A variety of the dog, trained 

 to find birds. 



Seventh. In music, the interval between any 

 note and the one six notes above it, as be- 

 tween A and G, B and A, &c. 



Sex. v. Sexes. 



Sexagesimal, (seks-a-jes'i-mal). [L. sexayesi- 

 mus, sixtieth.] Belonging to 60: used for the 

 English system of arc measurements, in 

 which a degree equal 60 minutes, and a 

 minute equal 60 seconds. 



Sexes, (seks'es). [Sexus, the Latin word.] 

 Male and female: marked chiefly by differ- 

 ence in generative functions, but also usually 

 by many secondary differences. 



Sextane=Hexane, q.v. 



Sextant, (seks'tant). [L. sextans, sixth part.] 

 An instrument for measuring the angular 

 distance of objects; resembles the quadrant, 

 but measures only 60 instead of 90. 



