( ) 
placed direaiy before the eye 5 but then it came from 
the two fides which reprefent a part of the Frame, and 
are ftiown in this figure by the Letter X. 
Now when the hinder part of fach a Sand is brought 
before the fight, I obferve that it has the (ame figure^ 
and that then^ that part of it, which I fliould have de- 
fcribed as a dark circle of the fhining Sand, was compos'd 
of twelve bright, ,dval, flat fuperficies. 
I gave the Limner another hexangular Sand to draw, 
whofe bright Superficies or Area was of a different make 
from it$ circumference,for there appeared in the middle o£ 
them feveral triangular figures5which5 tho they were feme- 
thing rais'd or imboft^ were very bright, which was very 
pleaiant to behold ^ fee Fig, 7. A B C, and altho the cir- 
cimference in this pofition appeared very dark, yet the 
fides thereof, when oppos'd to view, were no jefs bright 
and (hining. - 
I caused the Painter to defign another grain of Sand, 
which is rcprefented by Fig. 8. D E FGH with its pro- 
tuberant parts and their refpeftive fides 5 but it is impou 
fible to defcrtbe with the Pen the beauty and variety of 
the figures in the faid Sand, , neither can any body imagin 
it but thofe that fee it. 
I turned the oppofite fide.of - the faid Saod to my Glafs, 
wherelDy 1 difcover'd the feveral fhining Angles thereof^ 
asinFig, 9.1 KL M, . 
i' placed another fmall {liiniog Sand before my Glafs, 
which appeared as in Fig. 10. 0 P CLR, feveral of whofe 
fides were liobleraifht^ in a w^ord, if 1 fhoold undertake 
to give yon a view .of a thoofaod others, and ihould enter 
upon a ftrift examination of every one of them, I doubt 
not but we ftioold difcover every one of them to be of a 
different fize and figure, befides feveral other particulari- 
ties which might be peculiar to each one, as the great Rent 
or Breach^ which in fig. 8. is defcrib'd by a a. 
Ebbbbbbbb 
