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... R OYAL POLYTECUNIC INSTITUTION. - W LECTURE on the BALLAD MUSIC of ENGLAND, by Mr. tieorge Batker, illustrated by his own compositions, every Evening (except Saturday), at Eight o'cloek.-LECTUBE on the HYDRO- FL t1rRIC MACHINE, by Dr. Boobbhoffner, daily at Two. and on Tueiday and Thursday Evenings, at a quarter-paet Nine. LECBUltE onCHEMISTRY, by.H. epe r, E ., illrustratingtheANCIENT FIERY ...