ADELAIDE GALLERY.
AN exhibition of the powers of two new additions by Mr. CARY tO his Gas Microscope took place at the Adelaide Gallery on Thursday evening. The highest magnifying power hitherto shown by this or any other microscope is three millions times. The additional power given to the instrument by Mr. CARY'S improvements has not yet been computed ; but a correct idea of the wonderful increase may be formed from this fact,—a flea magnified three million times appears about twelve feet long; but when seen under the highest power of Yr. CARY'S microscope, it is too large for its length to be contained in a disc of eighteen feet diameter ; and the height of its body alone, viewed in profile, appears to be fourteen feet. Even with this immense nsag- nifying power, the light thrown on the object is sufficiently strong to show its structure distinctly, and make it appear semi-transparent. A drop of water, in the act of being decomposed by voltaic agency, was
shown through this magnifying medium ; and the appearance and action of the different particles, as the gases became disengaged, resembled those of the bubbles caused by the rushing in of a stream of water into a cistern. If the powers of the telescope should be increased as those of the microscope have been of late, we may expect to ascertain by ocular de- monstration that there are cities in the moon, if we should not discern the inhabitants.
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