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CALCULATING BoY.-Among the many boys employed for the different purposes of calculation on the ordnance survey of Ireland, there is at present named Alexander Gwin, only eight years old, and native of Derry, whose abilities ut his early age truly surprising He has got by the fractional legarithms from l to 1900, which he will repeat in regular rotation, otherwise, the nterrogator may put the questions It is certainly astonishing think tender mind retain with such tenacity anilcorrectness seven figures of an (accordng to their different variatons) for 1000 numbers. His iapdy and correctness the various calculations of tigononetrical distances, trangles, &c., anna zingly beyond any thing we have witnessed. He in less than minute make return in acres, rods, perches c., of any quantity of land, by giving him the surveyors chained distances, while the ( .eatest arthmetician, with all lis knowledge, will certainly take nearly hour do the same and not to be certain of truth in the end -