<0 |. 
Schem. 4. 
‘that I was fain to determine its tranfparency by one glafs, and-its texture 
ly creas'd'that being put into that fhape when wet,and kept fo till they be 
‘ why the partsof the wale 4, 4,2,a,4, 4, fhould appear bright; and why 
It appear black; asalfo,on the other fide, why the fmoothing or burnith- 
MrcrROGRAPHIA. 
manifeft to difcern the impreffions upon thefe wales, left by thofe that 
were preft upon them,which lying not exa¢tly parallel with them,buta lit- 
tle athwart them, as is denoted by the lines of,0 00 0, gh. eh.gh, between ~ 
which the other wales did lie parallelsthey are fo varioufly,and irregular- 
rie, they fo fet each others threads, that the Moldings remain almoft as 
long as. the Stuff lafts. 
Hence it may appear to any one that attentively confiders the Figure, 
the parts b, 5, b,b,b,b, thould appear fhadowed, or dark; why fome, as 
d,d,d,d,d,d, fhould appear partly light,and partly dark: the varietiesof 
which reflections and fhadows are the only caufe ofthe appearance ofwa- 
tering in Silks, or any other kind of Stuffs. | 
From the variety of reflection, may alfo be deduc'd the caufe why a 
fmall breez or gale of wind ruffling the furface ofa {mooth water, makes 
ing the furface of whitened Silver makes it look black ; and multitudes of 
other phehomena might hereby be folv'd, which are too many to be here 
infifted on. Ls 
~Obferv. VI. Of fnall Glafs Canes. 
Hat I might be fatisfid, whether it were not poffibleto make an 
' Artificial pore as fall as any Natural 1 had yet found; I made fe- 
veral attemps with {mall g/a/s pipes, melted inthe flame of a Lamp, and 
then very fuddenly drawn out into a great length. And, by that means, 
without much difficulty, I was able to draw fome almoft as {mall asa 
Cobweb, which yet, with the Afcrofcope, I could plainly perceive to be 
perforated, both by looking onthe ends of it, and by looking onit againft 
the light 5 which was much the eafer way to determine whether it were 
folid or perforated; for, taking a {mall pipe of glafs, and clofing oné 
end of it, then filling it Aa/f full of water, and holding it again/t the light, 
I cculd, by this means, very eafily find what was the differing afpe of a 
folid and a perforated piece of glafs 5 and foeafily diftinguifh, without _ 
feeing either end, whether any Cylinder of glafs 1look’d on, werea folid 
ftick, or a hollow cane. And by this means,] could alfo prefently judge of 
any {mall filament of gla{s, whether it were hol/ow or xot, which would 
have been exceeding tedious to.examine #3 looking ontheend, And 
many fuch like ways I was fain tomake ule of, in theexamining of di- 
vers other particulars related in this Book, which would: have beenno 
eafie task to have determined meerly by the more common way of look- 
ing on, or viewing the Object. For, 1f we confider firft, the very faint 
Hight wherewith the object is enlightened, whence many particles ap- 
pear opacous, Whichwhen more enlightned, appear very tranfparent, {0 
by another Next,’ the unmanageablene/t of mott Objetts, gee 
