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Show Upjhl1in Ij.m rtud liisca. Inllghthonict) theronre ale order ot light, graded according to thtlr int-n ttty. 'llio lamp of tho lowcat uraixth order, which counumea only lialf a gill r f tual oil mi hour, gh ea about a much light a an ordinary i-nrlor rending binp (nay U mt.'Uo pirwer), whilo the .argent or tint order lamp, which 1mm Mxtren gUUan hour, gUea 450 candle I-jwirof light, ltiit whilo tho nakM ilrtmo of tho lamp glvea thli much light, tho Trench free-mi len Inwhtrh th liuipUiet condmnea and concentrate thli light, ao that it 1 imiltlplidl In jwwer many Huh. Tim tho llttlo 12 caudle omr llamo of thoitxth unlet lamp ha lu it len n power of 73 vandlcn, and tho irreat 410 eundlo iwwer Hahtot tho tint onr lump, when placed, In it mormons len, give a owerof tome 19,000 candle, biuh a len U13 f.tt high and hi ft OlamoUr of 0 feet, llar.tr' Young People, |