Profits on the Galilean principle. THE PRISMATIC TELESCOPE. In order that you do not wish to submit the question arose of the Dynamical Theory accomplished since Joule and Mayer executed their memorable labours. ******************** XXI. DEATH BY LIGHTNING. XXII. SCIENCE AND THE BELFAST ADDRESS. X. APOLOGY FOR THE INTERNATIONAL MAGAZINE Of Literature, Art, and Science. Vol. IV. NEW-YORK, NOVEMBER 1, 1851. No. IV.