[ ^54 ] 



Hence I conclude, that loo grains mere ftronthian earth take 

 up 47,79 of real acid (fince 3795 take 18,11 of real acid) and 

 would afford, as we fljall prefently fee, 254,84 of cryltallized mu- 

 riated ftronthian, or 147,79 of deficcated ftronthian*. 



And 100 strains real marine acid enter into the comp'^f tion of 

 209 grains of deficcated ftronthian, or of 360 of the cryftaliized. 



Again, Dr. Hope found, that 100 grains cryjiallized muriated 

 Jirotithian contain 42 of water of cryjiallization^ and confequently 

 58 of deficcated which contain earth and acid in the proportion 

 above mentioned for loo earth to 47,79 acid) that is, 39,24 of 

 earth and 18.76 of acid, this proportion agrees very exadly with 

 that obferved by Pellitier-|-, for he found 100 grains of native ae- 

 rated ftronthian (which contain 69 of earth) to aftord 176 of cry- 

 ftaliized muriated ftronthian. 



And fince, in Dr. Hope's experiment, 39,24 of this earth af- 

 forded 100 grains of muriated ftronthian, 69 fhould afix)rd 175,8. 

 Some experiments hov> ever of Mr, Lowitz vary confiderably from 

 the above ftatements, it app ared to him that in muriated ftron- 

 thian the quantity of acid exceeded that of earth in the proportion 

 of 54 to 46 :}: ; if fo, 100 grains of muriatic acid of the fp. grav. 

 1,140 fhould contain 44,54 °f ''^^^ z-cx&t for it took up 37,95 of 



earth 



* 2Chy.An. 1793,?. 194- t 21 An. Chy. p. 128. % ift-Chy. An. 1796, p. 128, 129. 



