52 ESSAYS AND OBSERVATIONS 



and dried, weighed two drachm=^ and a 

 grain. The filtered water fufFered no 

 change Irom the alkaline lolution. This 

 experia ent was repeated with the fame 

 appearances upon the {hell marie of Ex- 

 periment 31. Hence it is manifeft, that 

 our marks, by expofidon to the air, had 

 acquired nothing of a faline nature. 



Ix Experiments 30. 31. it is mention- 

 ed, that the digefled waters left, upon 

 th ir evaporation, a fmall quantity of real 

 calcaiious earth. Left this earth fhould 

 be fufpeded to proceed from fome mar- 

 ley fait decompounded in the progrefs 

 of the evaporation, it mufl be obferved, 

 that the pure fountain water employed 

 in thefe experiments, depofited, by the 

 fame treatment, a quantity of qalcarious 

 earth equal to what was afforded by the 

 diverted waters ; and, from this circum- 

 flance, we may perceive, whence pro- 

 ceeded the increafe in the weight of the 

 marie which had been fubjeded to fb 

 long boiling. 



Up JN the farface of fome marley 

 rocks which looked towards the northj 



and 



