INFLAMMABLES. 305 



(h.) To divide a bar of iron ; when at ignition, or better at a white 

 heat, if rubbed with a roll of sulphur, the iron melts and falls in drops 

 of liquid sulphuret. 



" If a gun barrel be heated red hot at the but-end, and a piece of 

 sulphur be thrown into it, on closing the muzzle with a cork, or blow- 

 ing into it, a jet of ignited sulphurous vapor will proceed from the 

 touch hole. Exposed to this, a bunch of iron wire will burn as if 

 ignited in oxygen gas, and will fall down in the form of fused glob- 

 ules, in the state of proto-sulphuret. Hydrate of potash, exposed to 

 the jet, fuses into a sulphuret of a fine red color." Dr. Hare. 



5. POLARITY Electro positive; it goes to the negative pole in 

 the galvanic circuit. 



6. COMBINING WEIGHT, 16, hydrogen being 1. 



8. PHARMACY. No peculiar preparation is necessary to fit the 

 best roll and flowers of sulphur for medical use. Whether it is acid 

 may be learned from its taste, and from its effects on the test colors ; 

 if it turns the blue vegetable color red, it must be washed abund- 

 antly with hot water, and the addition of a little alkali will aid in re- 

 moving the acid. 



ACIDS. 



Preliminary Remarks. 



One of these bodies, vinegar, seems to have been always known to 

 mankind. In the progress of time ; accident, art and science have 

 either developed or formed many more. There can be no doubt, 

 that the acids are all compound bodies, and that the only one which 

 remains undecomposed, the fluoric, has an inflammable base, like the 

 rest : for, with this exception, all of the hundred or more that are 



39 



