Experiments and Observations, 77 
fore, could not render the iron calx fo far phlogifticated as to 
a fifed the magnetic needle. 
EXPERIMENT II* 
In order to diverfify the preceding experiment, I drilled a 
hole, about one-eighth of an inch long, and little more tham 
one-fiftieth of an inch in diameter, into a piece of brafs that 
was not rendered magnetic by hammering, and filled it with 
crocus martisy then I hammered the piece of brafs, thus in- 
clofing the calx of iron, and afterwards prefented it to the 
needle; but there was not the lead: fign of attraction : the 
martial earth, therefore, had not acquired any phlogifton from* 
the brafs by the adion of hammering. 
EXP E R I M E N T III. 
The piece of brafs mentioned in the preceding experiment, vtz» 
with a little calx of iron in it, was put into the fire, and was made 
quite red-hot, in which ftate it remained for about three mi- 
nutes. Then, after cooling, it was prefented to the magnetic 
needle, and this was attraded by the brafs only in that place 
wherein the calx of iron was contained. The adion, there- 
fore, of the fire had rendered the martial earth fo far phlogifli- 
cated as to attrad the magnetic needle; hence, if the mag- 
netifm of brafs was owing to any ferrugineous matter contained 
in it, a piece of brafs ought to become magnetic when foftened, 
which is contrary to the experiments mentioned in this 
paper. 
32 X P E« 
