394* Intelligence and Miscellafieous Articles. 



those of M. de Saussure, which do not differ so much as -nr<rjr from 

 his. — ^nri. de Chim. et de Phys. vol. xliv. p. 27, 



Hydrogen being iiniiy. Dr. Thomson's number for barytes will be 

 76 instead of 78 as he formerly determined ; his present analysis 

 nearly coincides with that of Berzelius. The following are the results 

 of the three chemists mentioned. 



Edit. 



ON THE OXICHLOR.VTES. BY M. SERULLAS. 



M. Serullas concludes from his experiments, 1st. That oxichloric 

 (perchloric) acid forms with potash a very slightly soluble salt, re- 

 quiring 65 times its weight of water at the temperature of CO°Fahr. 



2nd. That soda forms with the same acid a very deliquescent salt, 

 which is consequently very soluble in water, and even in the strongest 

 alcohol. 



3rd. That properties so opposite and derided, afford a method of 

 .separating potash and soda when in solution ; the latter yielding, as 

 has been already stated, an oxichlorate very soluble in concentrated 

 alcohol, and the former an oxichlorate which is absolutely insoluble 

 in it. 



4th. Tliat in the same experiment any acid may be separated from 

 the potash which is combined with it ; the acid being always set at 

 liberty by the oxichloric acid. 



5th. That the employment of oxichlorate of silver for the mixtures 

 of the chlorides of sodium and potassium, and the employment of 

 oxichlorate of barytes for the mixture of the sulphates of these two 

 bases, renders it, by the intervention of alcohol, extremely easy to 

 separate all the elements completely. 



Oxichlorate of potash is composed of 



Acid 34-275 



Base ,. 65.725 



100000 

 As bitartratc of potash is soluble in 60 parts of water, and oxichlo- 

 rate requires 65, oxichloric acid when added to a saturated solution 

 of the bitartrale occasions slight precipitation. 



Oxichlorate of barytes is deliquescent, very soluble in water and 

 in alcohol : the solution when evaporated in a stove yields long 

 prismatic crystals ; paper impregnated with the solution burns with a 

 fine green flame. It is composed of 



Acid 54-423 



Base 45-577 



100000 



When 



