24 PHYSIOGRAPHY. CLASS I. 



Amorphous. Transparent. Expansible. 



Sp. Gr. = 2-247. BERZ. 2-1204. GAY-LUSSAC 



and THENARD. Odour pungent and acid, like 



that of burning sulphur. 



OBSERVATIONS. 



1. The gaseous Sulphuric-acid consists of 



Sulphur 50-144. 



Oxygen 49-856. BERZELIUS. 



At the common temperature of our atmosphere it is per- 

 manently elastic ; but it may be converted into a liquid 

 substance, by exposing it to either frost or pressure. It 

 is readily absorbed by water. 



2. This acid rushes out from active volcanoes, and is 

 found in considerable quantities, near Mount Etna, Vesu- 

 vius, &c. It occurs likewise, along with gaseous Carbonic- 

 acid, in a cave which is situated in the Biidb's hegy, a por- 

 phyry hill in Transylvania, on the frontiers of Moldavia. 

 At the foot of the mountain there are numerous acidulous 

 springs, which develope a considerable quantity of gaseous 

 Carbonic-acid. The walls of the cave described above, are 

 covered with a crust of prismatic Sulphur. 



2. LIQUID SULPHURIC-ACID. 



Liquid Sulphuric Acid. JAM. Man. p. 4. Schwefel- 

 saure. HAUSM. III. S. 799. Acide sulfurique. HAUY. 

 Tabl. comp. p. 1. Traitd de Min. 2de Ed. Tom. I. 

 p. 295. 



Amorphous. Transparent, in different degrees. 



Liquid. 

 Sp. Gr. = 1-857. BERZ. Taste strongly acid and 



burning. 



OBSERVATIONS. 



The anhydrous Sulphuric acid is solid, and consists of 

 Sulphur 40-14. 

 Oxygen 59-86. BERZELIUS. 



