394 ESSAYS and OBSERVATIONS 



and, with fyrup of violets, powder of galls, 

 oL -uhrioU, oL tartm i^p, d. and the folution' 

 Q^faccbarum Saturni, it exhibits the like 

 phenomena. 



From the preceeding Experiments we may oh- 

 fctve^ 



I. That this fpaw contains a princi- 

 ple of iron, which is volatile; for its cha- 

 lybeate quality is much weakened by boil- 

 ing (^3), or even by being expofed for 

 fome time to the air (12). 



2. It contains an iron principle, which 

 is fixed; for its chalybeate quality is 

 not entirely deftroyed, by being expo- 

 itQl to the air (12}, nor by boiling (13), 

 nor by evaporation to a drynefs (14, 15), 

 nor by burning the T^//^/^^/i/« (17); and, 

 vvhen its fak is calcined a fufficient time[ 

 it is attracted by the magnet (18 ). 



3. It feems, by turning green with fy- 

 rup of violets, to contain an alcaline prin- 

 ciple, v7hich is likwife fixed ; for neither 

 by being expofed to the air, nor by eva- 

 poration 



