- 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 person having what is called a ‘ hair- beautiful light without its being apparently accompanied: The proper pressure for the New York gas is that which lip,” nd such 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 specch is certainly sure o; gas at the burner is subject to…
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