Dr. ingenuous z on Air. 267 
a fub fiance, but each particle feparately had evidently 
two poles. Such iron filings mixed with bees wax, as 
much as is fufficient to keep them together, got a ftrong 
polarity by being touched with magnetical bars, and had 
all the qualities of a magnet: the mat's is eafily cut with 
a warm knife, and is very convenient for magneti- 
cal experiments, fuch as Dr. knight made with fimilar 
loadftones made of pounded magnets. I found alfo, that 
each particle of thofe granulated iron ores of Sweden, 
which are placed among the miner a ferri retraftoria, fe- 
parated iron from Hone, and had two diflant poles ; and 
that a piece of the ore itfelf became a tolerable good 
magnet by being touched with the bars. 
I am, &c. 
Mm2 
XVI. An 
