ORDER I. PHOSPHOROUS HYDROGEN-GAS. 19 



atmospheric air, in which state it has been the cause of 

 many melancholy accidents by sudden explosions. 



3. SULPHUREOUS HYDROGEN-GAS. 



Sulphuretted Hydrogen Gas. JAM. Man. p. 2. Schwe- 

 felwasserstoffgas. HAUSM. I. S. 63. 



Amorphous. Transparent. Expansible. 

 Sp. Gr. = 1-181. BERZ. 1-1912. GAY-LUSSAC. 

 Odour of putrid eggs. 



OBSERVATIONS. 



1. The sulphureous Hydrogen -gas consists of 



Hydrogen 5-824. 



Sulphur 94'176. BERZELIUS. 



It does not support combustion ; it blackens most of the 

 metals, and becomes fatal to animals if inhaled in any consi* 

 derable quantity. 



2. It is developed from sulphureous waters, both cold and 

 warm, as at Nenndorf, in "Westphalia, and at Baaden, near 

 Vienna ; also from swamps and marshes. In Italy both cold 

 and warm, it is disengaged from the soil of the Solfataras and 

 of the Fumacchie, sometimes mixed with other kinds of gas, 

 of which several instances have been mentioned by M. VON 

 PRZYSTANOWSKY, in his Memoir on the Origin of the Vol- 

 canoes in Italy. On the western bank of the Niagara river, 

 a mile south of the Falls, it issues from the bank, which 

 consists of a shelly limestone, including thin beds of coal 

 and Iron-pyrites. Under similar circumstances, it occurs 

 near Otsquaga Creek. A. EATON. 



4. PHOSPHOROUS HYDROGEN-GAS. 



Phosphuretted Hydrogen Gas. JAM. Man. p. 2. Phos- 

 phorwasserstoffgas. HAUSM. I. S. 64. 



Amorphous. Transparent. Expansible. 



Sp. Gr. = 0-9022. THOMSON. Odour of putrid fish. 



