National Intelligencer announces that Whigs will hold mass meeting at "their Platform" at 7 P.M. to celebrate anniversary of defense of Fort Harrison, "the first of the glorious achievements of the gallantZachary Taylor." J. E. Brady of Pennsylvania, A. Lincoln of Illinois, J. M. S. Causin, T. F. Bowie, T. G. Duckett and Z. C. Lee of Maryland, and L. F. Tasistro of New York are expected to speak.