HAIR. 
becomes entirely obliterated before the period of item 
panne Bory etornegieti tain nto a folid point 
The end of a orms an irregular folid bulb betbre it 
pe from which’ it is fo well conftruéted for being em- 
d as a needle by fhoemakers 
e hair of the satis head and pubis, that of the beards 
of man and quadrupeds, and the hair of the tails and manes 
beafts, are e therefore always have the 
roots foft and filled by the pu 
We hav 
All that eas of the tube of a hair to —— the pul ak 
b 
times of a different tint in childhoad, than it becomes after. 
anima are 
ina dere fubject t to Pe fame variations ; ehits a ‘hovfe which 
is a dark grey when young, becomes w hite by age. 
td .. 
often sesccived fuppofes that the air is furni th iby fo ed the lofs of colour to commence at the | ,oint, and gra- 
the pulp for the nutrition of the hair, but Prowl is every rea- dually to advance towards the root, Ina few inftances 
fon to: ges the eo it is Spe from the atmofphere in con- we have obferved this portions of the hair grey in the mid- 
© thers is attraéted from the external element. 
FEATHERS 
The whifkers of the feat fhew the appearance of a tube 
almoit to the very point: fmall hairs are probably alfo hol- 
jow throughout, as every part of them has been moulded 
upon the pulp; every hair fhould, the 
erefore, by re 
asa tube fhut at the pointed extremity, and filled eit 
with a vafcular pulp, or a medulla formed of cells ek g 
coe “tn of vegetables. 
ftance of a hair perfeétly refembles horn in its 
vt agen briftles and feveral other kinds of hair, 
rr ‘fubltance drranged in fibres in the fame manner 
4 
as the woody fibres of a can 
eres Bichat has given a Scent account than the above of 
the flru@ure of hairs. He deferibes them as aA com- 
poled of two diftinét parts. i rnal 
feeage he « 
he peculiar chara@ters and. colour of 
1 the pines and difeafes to which i it is liable. 
ecicdeaks tome 
r'tube of he hae 3 hick it cae: 
an hey etn ftain or dye, in > manner as the 
uw ty terete or hoof is ¢ cchicts d. 
_ Bich fi »potes: that there isa lage of BS tial in the 
or paths e of the hair, 4 “oh wil 
wes elogi. and pete thy which is known to 
etween the hair and’ m a Fhe rtant orga 
s of the fs tnasetphe “dys, on "that rhe wap ae 
vital quainted with one dees “do became almoft erttitely 
_ grey inthe courfe of a fingle ni ate ese 
explains the. 
of oe re sae i 
2 Sec tave Bon 
4 to ee ee :olou 
Thefe facts leave no ub ith refp 
dle; and we have feen the hairs of the mane and tail o 
horiel becoming white at their roots ; fome hair-dreflers alfo 
affert, that the hair of ae uman head occafionally changes 
to aah “ted next the root 
ance o it, an which is. not 
fuppofed n Bichat, but in Ab elas or ieee 
the hair, The filvery or gliflening mppEntance of arey a 
depends upon the light being refract 
ts tran parent 
‘in pels Oe 
parietes, and itriking upon the ce 
pith in the interior ; 
It may be afked, Bey is the colouring matter removed 
from the fn fubftance of the hair? There appears only two 
means by which it can be accomplithed ; it muft aig 
diffipated from oe furface of the hair, or carri k into 
the fyftem by abforption ; the latter appears mott 
bable. : a hair become grey aye es or 
ae of ioe of its parts, th ge WwW not be 
an fe s generally ap- 
pear to rhe ge Pans aie thicker ae Selon nd are lo 
in being thed than thofe that have preferved their colour. It 
be ed, that no means will have oa effect of turning 
hairs Breyy = oes are * Femnoved fr 
known woe we ring 
