84 CHLORINE AND IODINE. 



rine gas is collected over water in temperatures 

 chlorine, below 40, a number of green coloured crystals 

 form. These crystals were considered as solid 

 chlorine, till Sir. H. Davy showed, in 1810, that 

 they were a compound of chlorine and water, or 

 a hydrate of cftlorine. During the severe winter 

 of 1822-3, this hydrate was analyzed by Mr. 

 Faraday, who found it to be composed of 



Chlorine 27'7 or 4-5 



Water 72.3 11-745 



100-0 * 



11*745 exceeds 10 atoms of water by 0'495, 

 which is rather more than ^ of an atom. It was 

 doubtless hygrometrical water. These crystals, 

 then, must be considered as constituting a deca- 

 hydrate of chlorine composed of 



10 atoms water 11-25 



1 atom chlorine 4-5 



15-75 



Chlorine II. Chlorine, according to the experiments of 

 <ygen, ^ jj D avv anc i Count Von Stadion, combines 

 with no fewer than five proportions of oxygen, 

 forming three oxides and two acids. The com- 

 position of these different compounds, which, 

 with the exception of chloric acid, have been 

 analyzed only by Davy and Von Stadion, is as 

 follows : 



* Annals of Philosophy, (second series) V. 304. 



