[NEW APPLICATIONS OF MANGEL-WURZEL.][THE MARTYRDOM OF FAITHFUL IN VANITY FAIR.][VARIETY OF AMBER.][HAVE SERPENTS TASTE?][AN AMERICAN EDITOR.]CHAMBERS' EDINBURGH JOURNAL CONDUCTED BY WILLIAM AND ROBERT CHAMBERS, EDITORS OF 'CHAMBERS'S INFORMATION FOR THE PEOPLE,' 'CHAMBERS'S EDUCATIONAL COURSE,' &c.