BLA 



SUPPLEMENT. 



BRI 



th^ coal formation of Scotland and Stafford- 

 shire, an.l also iu Westph-Uia. It is the 

 richest source of the iron of Scotland. 



BLACK DROPS, a solution, it is supposed, 

 of opium and verjuice. 



BLACK. JACK., sulphide of zinc or blend, 

 so named by miners. 



BLACK. WASH, a lotion of lime-water and 

 calomel. 



BLANK CARTRIDGE, a cartridge of powder 

 without ball, used at reviews and drill, and 

 for saluting. 



BLANK VERSE, a rhythmical form of 

 poetical composition, consisting in Italian of 

 eleven syllables, but greatly enriched in iis 

 musical power and onomatoposia by Shake- 



not be cut to any advantage, and Is only 

 useful for cutting other diamonds when 

 reduced to powder, 



BORNEO CAMPHOR, a camphor obtained 

 from Dryobalanopt Campkora. 



BORNITE, a name jf purple copper ore ; 

 also of a variety of telluric bismuth. 



BOTANY BAY GUM, a gum resin obtained 

 from Xanthorrhaea resinifera. (X. hastilit.} 



BOTRYTIS INFESTANS, a parasitical species 

 of fungus belonging to the genus Botrytit : 

 they are microscopical moulds or fungi. B. 

 Infettans is the fungus developed in the pro- 

 cess of the potato disease, though it may be 

 doubted whether it is not rather the effect 

 than the cause of disease ; all unhealthy or 



speare's use of it in the English drama, who decaying vegetable matter being liable to 

 frequently makes twelve syllables by doubling | such parasitical visitants. The disease in 

 the short syllable at the end, and also as ; silkworms called muscardine is characterized 

 often reduces It to ten. For intense, and at by the presence cf another species of Botry- 

 the same time flexible, expressive power, 

 his lines are the model of English blank 

 vers. ; and Milton's more uniform adhesion 

 to the ten syllables makes his lines heavy 

 and monotonous in comparison. 



BLASTCS, the plumule and radicle of 

 grasses. 



BLEPHARITIS, inflammation of the eye- 



lids. 



cylin lers of metal so placed over a flame as 

 to diiect the current of atmosphere as a 



BLEU DE PARIS, one of beautiful perma- 

 nent blue aniline dyes produced by the 

 action of bichloride of tin on aniline. 



BLIND STORY, the triforium, as distin- 

 guished from the clerestory in ecclesiastical 

 architecture. 



BLINDAGE, a proof roofing over a maga- 

 zine. 



BLOCK. PLAN, the first rough ground-plan 

 of a building. 



BLOCK-SHIP, a ship of. war employed on 

 coast-line duty for local defence. 



BLOND METAL, a clay ironstone found in 

 the Staffordshire coal measures. 



Boccius' LIGHT, a burner invented by 

 Boccius, consisting of a pair of concentric downward currents pass each other without 



us, B. Batsiana. 



JULE, a name given to the Senate of 

 Athens. 



BOULE-WORK. or BUHL, marquetry work 

 of inlaid woods, tortoise-shell, gilt metal, Ac. 

 There were two French cabinet-makers, 

 father and so, who excelled in this work 

 during the reign of Louis XIV., and the 

 name of this sort of work was derived from 

 theirs. 



BOULES DE NANCY, the Globuli Martiale* 

 of the old chemists. They are small balls of 

 potassio-pertartarate of iron. 



BOYLE'S FCMI.VG LIQUID, a foetid liquid 

 consisting of bisulphide of ammonium. 



BOYLE'S LAW OF GASES. This law is, 

 that " the volume of a gas is inversely as 



the pressure ; ' 



in other words, the 



volume of a gas is reduced in the same pro- 

 portion as the pressure is increased. 



BRATTICE, a partition in the main shaft of 

 a mine which divides the upward from the 

 downward current of air. A na'ural brat- 

 tice is a shaft in which the upward and 



bstructiou, though there be no partition 

 between them. 



supporter of combustion, and increase the j BREECH-LOADING, a system of loading 

 illuminatinz power. guns, &c., reintroduced in modern gunnery. 



Boo BUTTER, hartite, found in Irish It has many disadvantages, and also many 

 peat-swamps. (merit?, among the more important of which 



BOILERPLATE, a name given to plate- are the facility it gives for rapidity of fire, 

 iron, now used for various purposes of con- 1 and the more complete ventilation of the 

 struction. Its resistance is about twenty gun. 



tons to the square inch ; the rule of safety BBEEDING IN AND IN, the close-breeding 

 in use being to leave three-fourths of the of race-horses and cattle, or breeding into 



power of resistance in reserv 



BOLOGNA PHIALS, unannealed glass phials 

 which have the peculiarity of at once flying 

 to pieces when scratched by any sharp or 

 angular body, such as a grain of sand, but 

 which will bear the dropping of a lead bullet 

 into them without injury. 



BOORT or BORT, a variety of the diamond 



the same stock. 



BREMER GREEN, a green pigment made 

 by mixing the carbonates of copper and 

 lime with alumina. 



BRETVTALDA, the title of the chief kin? 

 of Anglo-Saxon England during the 



Heptarc 



ptarchy. 

 n the lead 



He appears chiefly to haye 

 er of the united forces of the 



apparently twisted and convolved during : various kingdoms azainst a common enemy. 



the process of crystallization, so that it can- BRIDGEWATER TREATISES, a series of 



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