OF BARYTES. '281 



water ; but the pure nitrate of barytes is anhy- 

 drous, being composed of 



1 atom nitric acid 6'75 

 1 atom barytes 9*75 



16-5 



From the analyses of this salt by Kirwan, and 

 Fourcroy, and Vauquelin, and also from the 

 method which Dr. Forchhammer took to obtain 

 manganesic acid namely, heating black oxide 

 of manganese and nitrate of barytes, (the success 

 of which, he says, depends upon not driving off' 

 the water of crystallization of the salt) there is 

 reason to suspect that nitrate of barytes some- 

 times contains water of crystallization ; but I 

 have never myself seen the salt in that state. 



3. Carbonate of barytes. This salt is also Carbonate, 

 well known. It is anhydrous, and composed of 



1 atom carbonic acid 2*75 



1 atom barytes 9'75 



12-5 



k Phosphate of barytes. This is a tasteless Phosphate, 

 white powder, insoluble in water, and therefore 

 not capable of being obtained in the state of 

 crystals. It is anhydrous, and composed of 



1 atom phosphoric acid 3-5 

 I atom barytes 9'75 



13-25 



