gases ooktai.mm; HYDROGEN. 77 



rate of 267 cubic inches a minute, or 222 cubic feet a day. 

 The gas from these nitrogen springs contains only 2 or 3 

 per cent, of oxygen, and often a very little carbonic acid. 



CARBURETTED HYDROGEN. 



Carburetted hydrogen consists of carbon 75, hydrogsn 25 ; 

 burns with a bright yellow flame. It is the same gas nearly 

 that is used for lighting the streets in some of our cities. I 

 issues abundantly from some coal beds and beds of bitumi 

 nous slate. At Fredonia, in western New York, near Lak 

 Erie, it is given out so freely from a slate rock, that it i 

 used for lighting the village. A vessel containing 220 cubi 

 feet is filled in about 15 hours. A light-house at Portland 

 harbor, on Lake Erie, four miles from Fredonia, is also 

 lighted with the same gas from other springs. 



Another carburetted hydrogen, burning with a pale blue 

 flame, rises in bubbles through pools of water, owing to 

 vegetable decomposition in the soil beneath. 



PHOSPHURETTED HYDROGEN. 



Phosphuretted hydrogen consists of phosphorus 91*29, and 

 hydrogen 8*71. It takes fire spontaneously. The phos- 

 phoric matter, called Jack-o'-lantern, sometimes seen float- 

 ing over marshy places, is supposed to be phosphureted 

 hydrogen. 



SULPHURETTED HYDROGEN. 



Sulphureted hydrogen consists of sulphur 94*2, hydrogen 

 5*8. It has the odor and taste of putrescent eggs and burns 

 with a bluish flame. It is abundant about sulphur springs, 

 issuing freely from the waters, as in western New York and 

 in Virginia. It is sometimes found about volcanoes. It 

 blackens silver and also a common cosmetic made of oxyd 

 of bismuth. 



muriatic acid. — Hydrochloric Acid. 



Muriatic acid gas consists of hydrogen 2*74, chlorine 

 97*26. It has a very pungent odor and is acrid to the skin. 



What is the composition of carbureted hydrogen? its general charac 

 ters ? mode of occurrence in nature? What is said of Fredonia 

 Mention the characters of phosphureted hydrogen ; the characters of 

 sulphureted hydrogen ; its mode cf occurrence. What is said of muri- 

 atic acid ? 



7* 



