[ 222 ] 



hence they lofc 7 5 per cent, of their weight when ftrongly heated 

 2 An. Chy. 297, 298. 



But according to i Bergm. 29 and 373, the chryftallized con- 

 tains but 30 per cent, of fixed air, with whom Butini agrees, but 

 he afterwards found even common magnefia to contain a larger 

 proportion, fee p. 23 and 146 of histreatife; of the other ingre- 

 dients neither mentions the proportion. 



In common magnefia the proportions are, according to Bergman 



45 of earth 

 25 fixed air 

 30 of water 



100 



And according to Butini p. 146, 40,62 earth 



37,5 fixed air 

 21,88 water 



100,00 



According to Fourcroy 100 parts of common magnefia 

 contain 40 earth 



48 fixed air 

 12 water 



100 

 confequently they fhould lofe 60 per cent in a white heat. 



CoNSEqUENTLY 



