CHAP. IV. 



OF THE ATOMIC WEIGHTS AND SPECIFIC 

 GRAVITIES OF CHLORINE AND IODINE. 



THESE two substances resemble each other in so 

 many respects, that they ought to be classed 

 together. Their analogy with oxygen is also 

 very striking ; though they differ likewise in 

 some circumstances ; the most remarkable of 

 which is the property that they have of uniting 

 with oxygen, and constituting with it an acid 

 very similar in many respects to the nitric. I 

 shall treat of each of these bodies in a distinct 

 section. 



SECT. I. 



OP THE ATOMIC WEIGHT OF CHLORINE, AND THE 

 SPECIFIC GRAVITY OF CHLORINE GAS. 



IT has been demonstrated, that muriatic acid 

 gas is a compound of equal volumes of chlorine 

 gas and hydrogen gas, united together without 

 any change of bulk. Hence, the knowledge of 

 the specific gravity of dry chlorine gas at the 

 temperature of 60, and when the barometer 

 stands at 30 inches, will give us the ratio be- 



