GLOSSARY. 



95 



Jacob's Membrane. A layer of the 

 retina in the eye, described by Dr. 

 Jacob as a serous membrane, but 

 consisting of numerous rod-like 

 bodies placed vertically together. 



Jactita'tion (Lat. jac'tito, I throw 

 about). A tossing about of the 

 body; restlessness. 



Jeju'num (Lat. jeju'nus, empty ; be- 

 cause often found empty). A part 

 of the small intestines, reaching 

 from the duodenum to the ileum. 



Jo'vian (Lat. Jovis, the genitive case 

 of Jupiter}. Belonging to the 

 planet Jupiter. 



Ju'ga (Lat. jugum, a yoke). The 

 elevated portions traversing the 

 carpels of umbelliferous plants. 



Ju'gate (Lat. jugum, a yoke). In 

 botany, applied to the pairs of leaf- 

 lets in compound leaves. 



Ju'gular (Lat. ju'gulum, the throat). 

 Belonging to or connected with the 

 neck or throat. 



Julian (Julius Ccesar). A term ap- 

 plied to the system of reckoning 

 the year promulgated by Julius 

 Caesar, and which continued until 

 the adoption of the new style. 



Juras'sic (Jura, Mont Blanc in 

 Switzerland). A name given in 

 geology to the oolitic system, from 

 its occurrence in the Jura moun- 

 tains. 



Jurispru'dence (Lat. jus, law ; pru~ 

 den'tia, knowledge). The science 

 of law. 



Juxtaposition (Lat. juxta, near ; 

 pono, I put). A placing side by 

 side. 



Kalei'dophone (Gr. Ka\os, kalos, 

 beautiful ; t'8os, eidos, form ; 

 </>o>M7, phone, sound). An in- 

 strument consisting of an elastic 

 rod, with a polished knob at the 

 free end, which exhibits beautiful 

 curves of vibration when put in 

 motion. 



Kalei'doscope (Gr. Ka\os, Jcalos, 

 beautiful ; etSos, eidos, shape ; 

 o-KOTrew, skop'eo, I look at). An 

 optical instrument, formed on the 

 principle of multiplied reflection of 

 light, for the purpose of exhibiting 

 a variety of beautiful colours and 

 symmetrical forms. 



Ka'olin. A very fine earth or clay 

 consisting of decomposed feldspar, 

 used in the manufacture of porce- 

 lain. 



Kathetom'eter (Gr.*a0eT y, Jcath'etos, 

 perpendicular height; f^erpov, me- 

 iron, a measure). An instrument 

 for measuring small differences of 

 perpendicular height. 



Kelaenone'sian (Gr. Ke\cuvos, Teelai'nos, 

 black ; vt]<ros, nesos, an island). 

 A term applied to the inhabitants 

 of the islands in the Pacific, whose 

 skin is of a dark colour. 



Kelp. The ashes of seaweed, from 

 which carbonate of soda was pro- 

 duced. 



Kepler's Laws. The laws of the 

 courses of the planets, according to 

 Kepler: viz., that a line drawn 

 from the sun to the planets de- 

 scribes equal areas in equal times ; 

 that the planets move in elliptic 

 orbits ; and that the squares of 

 the periods of revolution of the 

 planets are very nearly in the ratio 

 of the cubes of their mean dis- 

 tances. 



Kilogramme (Gr. xiKioi, chil'ioi, a 

 thousand; Fr. gramme). A French 

 weight equal to a thousand grammes, 

 or 2-205 pounds avoirdupois. 



Kil'olitre (Gr.xA, chil'ioi, a thou- 

 sand ; litre), A French measure 



