Professor Meinecke, of Hallchas, in Gilbert's Annals, 1819, Number 5, proposed to illuminate halls, houses, and streets, by the electric spark; and expresses his strong persuasion that one day it will affard a more perfect and less expensive light than gas-illumination, and ultimately replace it. His plan is, to arrange, what are called, in electricity, luminous tubes, glasses, etc.; i.e. insulating substances, having a series of metallic spangles at small distances from each other, along the place to be illuminated; and then, by a machine, send a current of electricity through them: sometimes also partially exhausted glasses, as the luminous receiver, conductor, etc, are used. In this way Professor Meinecke obtained from a two-feet plate machine, a constant light in his apartment equal to that of the moon, and even surpassing it; and by enclosing his system of sparks in tubes filled with rarified hydrogen gas, in which gas it is assumed that the electric spark is more than doubled in brilliancy, he thinks it will be easy to enlarge the plan to any extent.