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earth in Klaproth's experiment already quoted, which is incon- 

 fiftent with the proportion of real acid. I have found in muriatic 

 acid in a multitude of experiments, and contrary to all analogy, 

 as we fee that by barytes and fixed alkalis betwixt which this earth 

 undoubtedly ftands, take up lefs than their own weight of real 

 marine acid; it is alfo contradidted by Pellitiers experiment, for 

 fince lOO grains native aerated flronthian contain 69 of earth, 

 thefe at the rate of 46 to 54 fhould take up 80 grains of real mu- 

 riatic acid, and the fum of both would be 149 grains: and fince 

 by Dr. Hope's experiment 58 grains of united earth and acid take 

 42 grains of water of cryftallization, 149 grains fhould take 

 107; and hence inftead of 176 grains of cryftallized muriated 

 ftronthian we fhould have 256 grains from 100 of aerated flron- 

 thian. 



KtAPROTH informs us, that from a folution of 100 grains of 

 aerated ftronthian in muriatic, precipitated by the addition of con- 

 centrated vitriolic acid, as long as any precipitate appeared, he ob- 

 tained no more than 114 grains of vitriolated ftronthian, and that 

 diied only in air*; whereas the precipitate Ihould amount, if the 

 whole of it Vv-ere obtained, to 118 grains ; for fince 58 grains of 

 this earth, as he elfewhere relates, f afford 100 of vitriolated 

 flronthian, 69 fhould afford 118; it is plain therefore that the ma- 

 rine 

 ♦■ 2 Qiy. An. 1793, p. 200. • f 2 Klapr. p. 97. 



