34 *the Principles of Part L 



but had a peculiar irony tafte, and turned 

 black with galls, 



Exp. 13. Some of this earth calcined in 

 a ftrong fire for two hours, was almoft all 

 attracted by the magnet. 



Exp. 14. It did not deflagrate with melt- 

 ed nitre. 



Exp. 15. Four ounces of brown till well 

 dried, being diftilled, in fix hours gave two 

 drams of a phlegm, which {hewed no acid 

 or alkaline nature. 



FROM thefe experiments it appears, that 

 this fpecies of till contained neither falts nor 

 oils, but was a competition of earth and 

 iron. The poifonous quality of this foil 

 muft then have depended on the latter bo- 

 dy, which we may obferve by the firit ex- 

 periment is diflblvable in all acids, and in 

 that ftate may enter the veflels of plants. 

 We fhall afterwards fee that it will meet 



with 



