SCH 



SCL 



lead, formerly confounded with the mo- 

 lybdate of this metal. 



SCHELLING'S PHILOSOPHY. A 

 system of philosophy, which teaches the 

 identity, or indifference, of the ideal and 

 the real. It was propounded by Schel- 

 ling about thirty years ago, and appears 

 to be directly opposed to the philosophy 

 of Kant. 



SCHERBEN COBALT. Testaceous 

 cobalt. Names formerly given to native 

 arsenic. It occurs in reniform and bo- 

 tryoidal shapes at Andreasburg, &c. 



SCHE'RERITE. A species of com- 

 bustible mineral found in a bed of brown 

 coal in Switzerland. It seems to be a 

 mineral naphthaline : its constituents 

 are, hydrogen, 24 ; carbon, 73. 



SCHIEFER SPAR. Slate spar. A 

 sub-species of limestone, also called 

 foliated carbonate of lime. 



SCHILLER SPAR. A mineral sub- 

 stance, constituting a variety of asbes- 

 tine ; it is also called metalloid diallage 

 or diallagite. It contains two sub-species, 

 viz., bronzite and common schiller spar. 

 The term is derived from the German 

 schillern, to change colours, and indi- 

 cates the changeable hues of the mi- 

 neral. 



SCHIST {schistus, that which may be 

 split). A term often used synonymously 

 with slate ; but it may be very useful to 

 distinguish between a schistose and a 

 slaty structure. The hypogene or pri- 

 mary schists, as they are termed— as 

 gneiss, mica-schist, and others — cannot 

 be split into an indefinite number of 

 parallel laminae, like rocks which have a 

 true slaty cleavage. The uneven schist- 

 ose layers of mica-schist and gneiss are 

 probably layers of deposit which have 

 assumed a crystalline texture. 



SCHISTOSE ROCKS. Rocks which 

 have the character of schist. See Schist. 

 SCHI'ZOPODS (<rx*'t«. to cleave, ttovc, 

 a foot). A tribe of long-tailed decapod 

 crustaceans, the legs of which are accom- 

 panied by an external articulated branch 

 as long as the limbs, which thus appear 

 double in number. The mysis, or opos- 

 sum shrimp, is an illustration of the 

 tribe. 



SCHMELZSTEIN. Another name for 

 dipyre, under which name the characters 

 of this mineral are noticed. 



SCHO'LIUM {axo^iov, a comment). 

 A remark or observation. In Geometry, 

 a scholium is a note or observation on a 

 proposition not containing any infer- 

 ence, or, at least, none of sufficient 

 297 



importance to entitle it to the name of 

 corollary. 



SCHORL {scorl, Swed., brittle). Com- 

 mon schorl is a sub-species of rhom- 

 boidal tourmaline, consisting chiefly of 

 silica, alumina, and oxide of iron, and 

 occurring imbedded in granite, gneiss, 

 &c. Blue schorl is a variety of Haiiyne. 

 Red and Titanitic schorl are names of 

 rutile, an ore of titanium. Schorl rock or 

 schorly granite is a rock, in which crystals 

 of schorl are added to the usual ingre- 

 dients of granite ; or when quartz and 

 schorl only occur, ttie felspar and mica 

 having disappeared. 



SCHORLITE, or SCHORLOUS TO- 

 PAZ. Pycnite of Werner. A mineral 

 consisting of alumina, silica, and fluoric 

 acid, occurring at Altenberg in Saxony, 

 in a rock of quartz and mica in porphyry. 

 SCHRIFTERTZ. Graphic tellurium; 

 a combination of tellurium with silver 

 and gold. 



SCI^NOIDS. A family of acan- 

 thopterygian fishes, nearly allied to the 

 Percoids, and named from the genus 

 scicena. 



SCIiENU'RUS. A genus of fossil 

 fishes, representing the perch and other 

 allied forms. Its remains are very com- 

 mon in the London clay of Sheppey. 



SCIENCE (scientia, knowledge). This 

 term, in its most comprehensive sense, 

 only means knowledge; in its ordinary 

 sense it denotes knowledge reduced to a 

 system; that is, arranged in a regular 

 order, so as to be conveniently taught, 

 easily remembered, and readily applied. 



SCINCO'IDiE. The Skink tribe, or 

 Serpent Lizards; a family of Saurian 

 reptiles, characterized by the shortness 

 of their feet, the roundness of their body, 

 and the equality of the tile-like scales 

 with which their body is covered. 



SCITAMINEiE. The Ginger tribe of 

 monocotyledonous plants. Herbaceous 

 plants with a creeping, often -jointed, 

 rhizome; leaves simple, sheathing; 

 flowers tripetaloideous ; stamens 3, dis- 

 tinct; ovarium 3 celled ; fruit capsular, 

 3-celled, many-seeded: seeds with or 

 without an arillus. 



SCIU'RID^ {a-Kiovpo^, a squirrel; 

 from aKta, shade, and oiipa, a tail). The 

 Squirrel tribe ; a family of the Rodentia, 

 comprising the squirrels, marmots, dor- 

 mice, &c., characterized by long, bushy 

 tails, and their adaptation to a residence 

 in trees. 



SCLERODE'RMI ( trKXrjpof, hard, 

 depfxa, skin). A famDy of Plectognathous 

 05 



