[ 258 ] 



to a gentle heat, and when no fenfible folution appealed he fepa- 

 rated what remained undiffolved, and found that after wafhing 

 and drying it, it weighed 19,625 grains ; hence he concluded 

 that 100,375 grains of thefe fhells were diffolved ; but then he 

 had no reafon to think the acid was faturated, or that in a longer 

 time it would not take up more, efpecially as the fliells were not 

 in a fine powder, nor did he apply any teft as I did. Having eva- 

 porated the folution to drynefs and heated the dry mafs to fufion, 

 he found it to weigh whilfl ftill red hot 106,125 grains. 



This fhews the folution not to have been faturated, for 

 100,375 gr^iiis of the fliells contained 53 of lime, and the 240 

 grains fp. of fait contain 54 of real acid by his own account ; 

 therefore, as faturated mariated lime lofes no acid in a melting 

 heat, the fait fhould weigh even by his eftimation 107 grains, 

 and by my calculation i 1 2 grains ; the remainder therefore of 

 the unfaturated acid was expelled by the heat of fufion. 



According to him loo grains lime fhould take up 102 grains 

 of the ftrongeft marine acid. 



It muft be remarked, alfo, that this fait though in a melting 

 heat ftill retains fome water, and Wenzel's experiment fhews how 

 much ; for by my determination ^;^ grains lime take up only 

 44,75 °^ ""^^^ ^^^^ '■> ^'-"^ ^^^ {\\m of the ingredients in Wenzel's 

 experiment amounts only to 97,75 grains ; yet he found the weight 

 106,125 ; then 8,375 gr«i-ins were water. 



Then 



