C ) 
Perpendicular to the Horizon, and to try whether, be- 
ing held under the North end of the Needle, it attradls 
it. Bat a jet better way is to try whether the upper end 
of the Rod attracts the South end of the Needle, for 
Attradtion is more fenfible than Expulfion. 
2. A fixt North Pole may be made with all the ways 
and Rods that you can make a fixt South Pole, but not 
vke verfa ; for there are many cafts wherein you can 
make a fixt North Pole, but not a fixe South Pole; and 
whatever way you get a fixt South Pole, 'tis weaker 
than a fixt North Pole made the fame way. Apply- 
ing a Needle to an ereft Bar, beginning at the top, and 
fb down, the Needle turns not at the middle, but nearer. 
Of fome Rods you cannot make a fixt South primarily, 
yet you may confequentially ; fo you may make one 
end a North Pole, and then the other end of tho'e P^ods 
may without more to do become a fixt South Pole : But 
this does not always hold, for the one may be a fixt 
North Pole, the other may be a Mutable Pole. 
3. Fire deftroys all fixt Poles, fc, whether made by 
the Magnet, or otherways but it increales, or rather 
lefs hinders that Magnetifm which proceeds from the 
Earth: Sc, a Wire or Rod of Iron heated at one end, 
that end is a Mutable Pole, but more vigorous while 
hot than if cold, /c. the ignited end held downwards, 
will attrafi: the ftid end of the Needle more vigorous, 
than if cold and fo if held upwards,it more attrafts the 
North end. The vigour of Mutable Poles is more in 
great than little Rods, but 'tis otherways in fixt Poles. 
4. Heat the end of a Rod of Iron red-hot ( or heat 
all the Rod ) and cool that ignited end Northward, it 
will be a (fixt) North Pole; if cooled South, it be- 
comes a ( fixt ) South Pole. This fay Gilhert and others 
from Experience. But I fay, this holds but in fome 
cafes; fc. if the Rod is fliort, you cannot make a fixt 
Pole that way : Take a round Wyre whofe Diameter is ; 
Inch, 
