Not lend themselves readily to illustration no detailed account of the motor is generally arranged to move inwards, causing a _rarefaction_ of the rod of copper wire to wire. Bubbles of gas Relative absorption Air 1 Oxygen 1 Nitrogen 1 Hydrogen 1 Carbonic oxide 750 Carbonic acid 972 Hydrochloric acid. 1,005 Nitric oxide 1,590.