( 4 *» ) 
with a lefler Globe included, in order to make that inner 
Globe capable of being inhabited, there might not impro- 
bably be contained fome luminous Medium between the 
Balls, fo as to make a perpetual Day below. That very 
great Tra&s of the Etherial Space are occupied by i'uch 
a ihining Medium is evident from the Instances given 
in the firft Paper of this /Tranfatfion : And if fuch 
a Medium fhould be thus inclofed within us ; what 
ihould hinder but we may be allowed to fuppofe that fome 
parts of this lucid Subfiance may, on very rare and ex- 
traordinary Occafions, tranfude through and penetrate 
the Cortex of out Earth, and being got loofe may afford.the 
Matter whereof this our Meteor confifls. This feems fa- 
voured by one confiderable Circumflance, viz. that the 
Earth, becaufe of its diurnal Rotation, being neceflarily 
of the Figure of a Flat Spheroid, the thicknefs of the Cor- 
tex, in the Pilar Parts of the Globe, is confiderably lefs 
than towards th q Equator; and therefore more likely to 
give Pafiage to thefe Vapours ; whence a reafon may be 
given why thefe Lights are always Teen in the North But 
I defire to lay no more flrefs upon this Conceit than it will 
bear. 
It having been noted that in the Years 1 575 and r 580, 
wherein this Appearance was frequent, that it was feen 
not far from the Times of the two Equinoxes; it may 
be worth while for the Curious, to beflow fome Attention 
on the Heavens in the Months of September and Ottober 
next; and in cafe it Ihould again happen, to endeavour 
to obferve, by the Method 1 have here laid down, what 
may determine, with fome degree of Exadtnefs, the Di- 
llance and Height thereof ; without which we can fcarce 
come to any juft Conclufion. 
FINIS . 
Errata-, No, 34 6. 383. /. 18. read 234 . />. 408. /, io. 
, read, proceed, as at fir ft . 
