424 ESSAYS AND OBSERVATIONS 



filled the above veffel, and found its 

 weight to be 2535^ grains ^. 



(c) Monday, at feven in the evening, 

 I poured upon a pound of calcined oi- 

 fter-fliells, frefli froni the fire, ten times 

 their weight of water ; next morning at 

 ten I decanted off the clear lime-water ; 

 and having filtered it as above, filled the 

 yeffel with it ; it weighed 2S197 grains. 



[d) Tuesday at mid-day, I poured 

 feven pounds of the fingle lime-water, [c) 

 upon one pound of calcined oifter fhells, 

 newly taken from the fire, ftirring them 

 well for fopne time after j at three quar- 

 ters paft fix in the evening, I decanted off, 

 and Altered as above, the clear lime-wa- 

 ter ; and, having filled the veffel with it, 

 found its weight to be 2545" grains. 



Hence it appears, that 100 cubical 

 inches of the lime-water {]?) exceeds, in 

 weight, that quantity of fountain water 



by 



* The oifterfliells made ufe of In this, and th? follow- 

 ing experiments, were gol; from among the rubbift oi^ 

 the fouth fide of, the Caftl? of Edinburgh, and were 

 quite free of any fea fait. 



