MicRoGRAP HILAL 189 
througtiout'ting’d with the colours they éxbibited. And/tis likely,that 
thofe hairs being boyl‘d or fteep'din thofe very hot ting’diliguors, in the 
Dye-fat, And the fubftance of the hair being much like that of an Oxes 
Horn, the penetrant liquor dots fo far mollifie and foften the {ubltance, 
that it finks into the vety center of it, and {o'the ting’d parts come to be 
mix'd and united with the very body of the hair,and do not (as.fome have 
thought) only ftick on upon the outward furface,,And this,the BAPE 
Horn will nake more probable 5, for we fhall And by that action, that the 
water will infinuate: it felf to a pretty depth within the furface of It 
efpecially ifthis penetrancy of the water be;much helped by the Salts 
that ate ufually mix’d with the Dying liquors... Now. whereas Silk may 
be dyed orting’d into all kind of colours without boiling ordi ing, in 
to hot liquors, [ ghefsi the reafon to bé two-fold.:, Firft, becauf the fila- 
thents;.or frtiall cylinders of Sik, aré abundantly fmaller and finer, and fe 
~ have a much lets depth to be penetrated then moft kind of hairs 5. and 
next, betaufe the fub{tance or matte? of Silk, is,ymuch more like a Glew 
then the fubftance, of Hait is. And that I have teafon to fuppofe; 
Firft, becaufe when it is {pun or drawn out of the Worm, itis a perfe 
lutinous fubftance, and very eafily ticks aind,,cleaves to any adjacent 
dy; as [have feveral times obferved, both in Silk-wormsand Spiders, 
Next, becaufe that [find that water does ealily diflolve and, mollifie, the 
fubftance again, which: is evident; from their manner of ordering thofe 
bottoms or pods of the Silk-worin béfore tliey-are able to uniwind them, It 
isno great wonder therefore;if okie or ting'd-liquors do very ick, 
_ly inollifie and tinge the farfaces of fo finall. and. fo.glutinous.a body. 
And weneed not wonder that the colours appear, fo lovely in the ont 
and fo dull in the other; if we view. but the ting’d cylinders of be 
kinds with a good AGeroftope 5 for whereas thé fubftance of Hair,at beftis 
bit a dirty dufkith white fomewhat tranfparent; the filaments of Silk have 
amoft lovely tranfparency and cleernels, the difference between thofe 
tex ‘being not ‘much lefs then chino hoesiiitnesseies nt ay Bie Spites 
‘Cryftals the one yielding a bright and vivid reettion from the con 
‘cave fide of the a that is; from the Concave furface of the A 
that i fies the back-part of the cylinder; the other yielding a dull 
and pérturb’d teflection from the feveral Heteragemtous parts that com 
_ poleit, And this differénce will be manifeft enough to the eye,if you get a 
Couple of {mall Cylinders, the fmaller of Cryftal, Glafs,the other of Born, 
and then varnifhing them over very thirly with fome ttanfparent colour, 
Which will reprefent tothe naked eye much the fare kind of object which 
isreprefented to it ftom the filaments Of Silk ahd Hair by the help of the 
Microfcope.. Now, fice thé threads of Silk and Sirge aremade up of a 
great number of thefe filaments, :we may henceforth ceale to wonder at 
the differétice. From mich the fame reafon proecedsthe vivid and lover 
ly colours of Feathers; wher¢inthey very farr exceed the natural as well 
as Artificial colouts of hdir.of which I thalHfay more 1# its es 
: ‘Teguments indeed of ereatures are all of them adaptes tothe pe- 
buliar ufe audconveniente of that Anisnal which they inyraps and very 
much 
