PHYSICAL AND LITERARY. \of 



of the chalybeate principle, and yet dif- 

 pover very little of it by the common ex- 

 periment with galls; fo that it maybe 



proper always to try it with the ol tart. 

 alfo : Vor the ftrength of the iron prmci- 

 pk is as the colour and quantity of the 

 clouds formed by this oil; that i^, if the 

 clouds are of a light yellowifh colour, ana 

 fmall in quantity, the chalybeate prmci- 

 pie is weaker ; if they are of a dark brown 

 Ind more in quantity, it is ftronger; if 

 they are of a green colour, the deeper the 

 green and more in quantity, the ftronger 

 is the chalybeate principle; which I have 

 found to correfpond with truth, by re- 

 peated experiments, not only on this 

 fpaw, but on folutions of vitriolum Mams, 

 of different llrengths, in common water : 

 But, how far this will hold in chalybeate 

 waters that are volatile, I have had no 

 opportunity to try. 



I took a chopin bottle of this water, 

 three months after it had been carried fif- 

 ty fix miles, ai^d poured one half of it in- 

 to another clean chopin bottle, and then 



corked them both very tight j the one 



bot- 



