LAB 



LAC 



supposing himself to know it ; lastly, if 

 two persons are each fully confident^ one 

 that the moon is inhabited, and the other 

 that it is not (though one of these opi- 

 nions must be true), neither of them 

 could properly be said to know the truth, 

 since he cannot have sufficient jproo/ of 

 \i."—Whately. 



KOBELL S DISCOVERY. A method 

 proposed by Kobell of Munich by which 

 pictures drawn in bistre or Indian ink 

 may be multiplied by the process of elec- 

 trotype, or gal vano- plastics. 



KO'LLYRITE. A white mineral 

 found in porphyry, in Hungary. 



KO'NIGINE. A green mineral, pro- 



bably consisting of a subsulphate of 



copper. 



^ KOUTHOLITE ((cotJ^oc, light, Xt'do?, 



a stone). A variety of prehnite found 



near Bareges. 



KRAME'RIC ACID. A peculiar sub- 

 stance supposed to exist in the root of 

 the krameria triandra. 



KUNDAH Oil. An oil obtained from 

 the seeds of the Carapa Toulouconna, 

 also called tallicoonah oil. 



KUPFERNICKEL. The German name 

 for sulphuret of nickel, in which the 

 metal is generally mixed also with arse- 

 nic, iron, and cobalt. 



LABA'RRAQUE'S SOLUTION. A 

 disinfecting liquid, consisting of a solu- 

 tion of the chlorides of lime and of soda. 

 It is analogous to the well-known bleach- 

 ing powder, chloride of lime. 



LABE'LLUM (dim. of labium, a lip). 

 A little lip ; the botanical designation of 

 the lip-like, or undermost, petal of orchi- 

 daceous plants. 



LABIA'TiE {labium, a lip). The La- 

 biate or Mint tribe of Dicotyledonous 

 plants. Herbaceous plants, with leaves 

 opposite ; flowers irregular, unsymmetri- 

 cal; stamens four, didynamous, inserted 

 into the corolla ; ovarium deeply 4-lobed ; 

 fruit 1 — 4 small nuts. 



LA'BIATE {labium, a lip). A botani- 

 cal designation of a gamopetalous calyx 

 or corolla, which is separated into two 

 unequal divisions, resembling lips, the 

 one anterior, the other posterior, with 

 respect to the axis. Hence, the term bi- 

 labiate is more commonly used. This 

 form of the floral envelopes is character- 

 istic of the Mint tribe. See LabiatcB. 



LA'BORATORY. A room properly 

 furnished for the performance of chemical 

 operations. 



LA'BRADOR FELSPAR. Labrador- 

 ite. A species of felspar found chiefly on 

 the coast of Labrador, and in the transi- 

 tion syenite of Laurwig in Norway. It 

 is also called opalescent felspar, from its 

 often exhibiting a beautiful play of co- 

 lours in cut and polished specimens. It 

 is probably a variety of albite. 



LA'BRID^. A family of acantho- 

 pterygious fishes, named from the genus 

 189 



labrus, or the wrasse. They comprise 

 the Parrot-fishes, so remarkable for the 

 convex form of the jaws. 



LAB RUM. Literally, the extremity 

 of the lips ; also, the brim of any vessel. 

 In Entomology it is applied only to the 

 lower lip of insects. 



LABYRI'NTHODON {KafivpivOo^, a 

 labyrinth, o6ovi, a tooth). The name 

 now given to the Cheirotherium, a sup- 

 posed crocodilian animal of considerable 

 size, to which have been referred the 

 singular footsteps found impressed on 

 several beds of marly sandstone in va- 

 rious parts of England and Europe, 

 bearing a remarkable resemblance to the 

 human hand. The present name is de- 

 rived from the complex or labyrinthine 

 structure of a section of the tooth, as 

 seen under the microscope. 



LAC {laak, Arab ). A resinous sub- 

 stance, improperly termed a gum, depo- 

 sited by the insect coccus lacca, on the 

 leaves and branches of several trees, over 

 its eggs, as a present protection, and as a 

 future food for the maggot. Stick-lac is 

 the substance in its natural state, en- 

 crusting twigs ; seed lac is the lac sepa- 

 rated from the twigs, and of a granulated 

 form, like mustard seeds ; shell-lac is the 

 substance obtained after purification ; 

 lump-lac is the seed-lac melted and 

 formed into cakes. Lac-dye, lac-lake, 

 or cake-lac, are designations of the colour- 

 ing matter extracted from the stick- 

 lac. 



LAC LUN-iE. Moon-milk; a snow- 

 white substance, resembling chalk, and 



