[ 405 ] 
ing pretty clofe, as is tifual in Woods without Un- 
derwood, his Body wiii then appear to be ten or 
twelve Foot in Breadth, according to the Diftance 
and CircuiTiftances of the Trees he is feen through ; 
and where there has been fome thin Underwood, or 
a few Saplings, I have obferved that the Sun fetting 
red, has appeared through them like a large extenfive 
Flame, as if fome Houfe were on Fire beyond them. 
Now the Reafon of this is obvious, viz. that being 
well acquainted with Trees, the Ideas of the Space 
they take up are in a Manner fix'd, and as one of 
thofe Trees fubtends an Angle at the Eye, perhaps 
not exceeding two or three Seconds, and would fcarce 
be diftinguifhable, were it not for the ftrong Light 
behind them, the Sun’s Diameter of above, thirty Mi- 
nutes takes in feveral of them, and therefore will 
naturally be judged vaftly larger. Hence 'tis evident, 
that thofe Bodies appear greater or lefs, according to 
the Objefts interpofed or taken in by the. Eye on 
viewing them. And to this only is that Pheno- 
menon to be imputed. 
I am fenfible this Method of arguing is not new,, 
yet the Obfervations here given may probably tend 
to illuftrate the Cafe beyond what had been ad- 
vanced on the Subject. $ * * 
FINIS* 
