t for practical purposes, artificial light without heat has almost everything else connected with the manufacture surprising manner. To use plain language, let us sup- not yet been applied. The fire-fly emits a soft and and burning of gas, by careful and thorough experiment. pose the case of a… … reached the retina at all.. These obscure rays were dis- late distinctly, and had not the power to swallow with- is exerted by about half an inch of water. As the pres- covered by Sir Wm. Herschel. out great effort. Her acquirement of speech is certainlv sure of gas at the burner is subject to…
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