( 340 ) 
Earth, and revolves within it a little flower, as is con- 
jediured by feveral, and to me feems mofl pro- 
bable. 
But if the magnetical Poles, by fuch a Motion as is 
defcribed, fhould in refped of the Terrella be tran- 
Hated with a Motion retrograde to that wherein ifwas 
kept by the Machine, I fhould think it poffiblefor the 
diurnal Motion of the central Magnet to tranflate the 
Polarity thereof farther Weftward by the Vertue of 
its own Effluvia, which are continually left a little 
behind, as it revolves on its Axle Eaflward, and that 
the faid Magnet is fixed to the Earth. But thefe 
Things feem uncertain. 
However, I think it not impoffible to reduce the 
Period of the Motion of the magnetical Pole, in re- 
fped of the Earth, to a tolerable Calculation in much 
lefs Time than an entire Revolution thereof, by mea- 
furing daily theQuantity thereof: For effeding which, 
1 have thought on a new Way of making a Needle 
not above 6 Feet long, with fome Engine- work to its 
Box, which, I believe, I can demonflrate will render 
it vifible daily to a naked Eye, that the Variation is 
changed : But I have no Time at prefent to defer ibe 
it, being but juft able to finifh this but if it may 
be acceptable, fhali readily communicate it on 
Notice. 
II. 
